diff --git a/30. CPP Programs/Bankdetail.cpp b/30. CPP Programs/Bankdetail.cpp
new file mode 100644
index 0000000..1ed77f4
--- /dev/null
+++ b/30. CPP Programs/Bankdetail.cpp	
@@ -0,0 +1,177 @@
+#include<iostream>
+#include<string>
+using namespace std;
+class bankdetail
+{
+	private:
+	string name;
+	string address;
+	int accountno;
+	float balance;
+	public:
+	  void inputdata()
+    {
+    	cout<<"enter account holders name = "<<endl;
+    	getline(cin,name);
+    	cout<<"enter holders address = "<<endl;
+		getline(cin,address);
+    	cout<<"enter account number = "<<endl;
+		cin>>accountno;
+		cout<<"enter amount in holders account = "<<endl; 
+		cin>>balance; 
+        cin.clear();
+         cin.sync();
+	} 
+		void showdata()
+	{
+		cout<<"account holders name = "<<name<<endl;
+		cout<<"account number = "<<accountno<<endl; 
+		cout<<"holders address = "<<address<<endl;
+		cout<<"amount in holders account = "<<balance<<endl; 
+	}
+		void deposit()
+	{
+		int add_amount;
+		cout<<" amount you want to deposit in your account = "<<endl;
+		cin>>add_amount;
+		balance=balance+add_amount;	
+		cout<<"new deposirt money = "<<balance<<endl;
+	}
+	void withdrawl()
+	{
+		int withdrawl_amount;
+		cout<<"enter the  amount you want to withdrawl = "<<endl;
+		cin>>withdrawl_amount;
+		balance=balance-withdrawl_amount;
+		cout<<"amount after withdrawing money = "<<balance<<endl;
+	}
+	void address_change()
+	{
+		string new_address;
+		cout<<"new address  = "<<endl;
+		cin>>new_address;
+		address=new_address;
+	}
+
+int search(int a)
+{
+	if(accountno==a)
+	{
+	showdata();
+ }
+  return 0 ;
+}
+};
+
+int  main()
+{
+	bankdetail data[2];
+	int ch,temp=0,a;
+	char ch2;
+	for(int i=0;i<5;i++)
+	{
+	data[i].inputdata();
+    }
+	do
+	{
+		cout<<"1-show all detail"<<endl;
+		cout<<"2-search by acc no"<<endl;
+		cout<<"3-deposit "<<endl;
+		cout<<"4-withdrawl your amount"<<endl;
+		cout<<"5-change address your address"<<endl;
+		cout<<"6-exit"<<endl;
+		cout<<"pleease enter your choice = "<<endl;
+		cin>>ch;
+		switch(ch)
+		{
+			case 1:
+				
+				for(int i=0;i<2;i++)
+				{
+				   data[i].showdata();
+			    }
+				break;
+			case 2:
+				
+					cin>>a;
+					for(int i=0;i<2;i++)
+					{
+						temp=data[i].search(a);
+						if(temp)
+						{
+							data[i].showdata();
+							break;
+				        }
+				        if(!temp)
+				        {
+						  cout<<"no detail found";
+					    }
+					}
+					break;
+		
+			case 3:
+			   	cin>>a;
+			   	for(int i=0;i<2;i++)
+			   	{
+			   		temp=data[i].search(a);
+			   		if(temp)
+			   		{
+			   			data[i].deposit();
+			   	    	data[i].showdata();
+			   	    	break;
+					   }
+					   if(!temp)
+					   {
+					   	cout<<"no detail found";
+					   }
+				}
+				break;
+				
+			case 4:
+				cin>>a;
+					for(int i=0;i<2;i++)
+			   	{
+			   		temp=data[i].search(a);
+			   		if(temp)
+			   		{
+			   			data[i].withdrawl();
+			   	    	data[i].showdata();
+			   	    	break;
+					   }
+					   if(!temp)
+					   {
+					   	cout<<"no detail found";
+					   }
+				}
+				break;
+				
+			case 5:
+            cout<<"enter the acc no. whose data you want to change = ";
+            cin>>a;
+                for(int i=0;i<2;i++)
+                {
+                    temp = data[i].search(a);
+                    if(temp)
+                    {
+                        data[i].address_change();
+                        data[i].showdata();
+                        break;
+                    }
+                    if(!temp)
+                    cout<<"no detail found";
+                }
+                break;
+             case 6:
+                    cout<<"thank you"<<endl;
+                    break;
+            default:
+                {
+                    cout<<""<<endl;
+                }
+                
+        }
+        cout<<"do you want to continue (y/n)"<<endl;
+        cin>>ch2;
+    }while(ch2=='Y'||ch2=='y');
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Employee.cpp b/30. CPP Programs/Employee.cpp
new file mode 100644
index 0000000..9c07e29
--- /dev/null
+++ b/30. CPP Programs/Employee.cpp	
@@ -0,0 +1,35 @@
+#include<iostream>
+using namespace std;
+class employee
+{
+    private: int Pan,Taxincome;
+             char Name[20];
+            float Tax;
+    public: void inputinfo()
+        {
+            cin>>Pan>>Name>>Taxincome;
+        }
+        void Taxcalc()
+        {
+            if(Taxincome<=250000)
+            Tax=0;
+            else if(Taxincome>250000 && Taxincome<=300000)
+            Tax=(Taxincome-2500000)*0.1;
+            else if(Taxincome>300000 && Taxincome<=400000)
+            Tax=5000+((Taxincome-300000)*0.2);
+            else if(Taxincome>400000)
+            Tax=25000+((Taxincome-400000)*0.3);
+        }
+        void Displayinfo()
+        {
+            cout<<Name<<"\n"<<Pan<<"\n"<<Taxincome<<"\n"<<Tax;
+        }
+};
+int main()
+{
+    employee ob;
+    ob.inputinfo();
+    ob.Taxcalc();
+    ob.Displayinfo();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Inheritance 2.cpp b/30. CPP Programs/Inheritance 2.cpp
new file mode 100644
index 0000000..ac1eaca
--- /dev/null
+++ b/30. CPP Programs/Inheritance 2.cpp	
@@ -0,0 +1,60 @@
+#include<iostream>
+using namespace std;
+class Apples
+{
+    protected:
+                int a;
+    public:
+                void c_apples()
+                {
+                    cout<<"Enter number of apples"<<endl;
+                    cin>>a;
+                }
+                void display_c_apples()
+                {
+                    cout<<"The number of apples are: "<<a<<endl;
+                }
+
+};
+class Mangoes
+{
+    protected:
+                int m;
+    public:
+                void c_mangoes()
+                {
+                    cout<<"Enter number of mangoes: "<<endl;
+                    cin>>m;
+                }
+                void display_c_mangoes()
+                {
+                    cout<<"The number of mangoes are: "<<m<<endl;
+                }
+};
+class Fruit:public Apples,public Mangoes
+{
+    private:
+                int t,n;
+    public:
+                void total_fruits()
+                {
+                    cout<<"Enter the number of fruits other than apples and mangoes: "<<endl;
+                    cin>>n;
+                    t=n+a+m;
+                }
+                void display_t_fruits()
+                {
+                    cout<<"The total number of fruits are: "<<t<<endl;
+                }
+};
+int main()
+{
+    Fruit ob;
+    ob.c_apples();
+    ob.c_mangoes();
+    ob.total_fruits();
+    ob.display_c_apples();
+    ob.display_c_mangoes();
+    ob.display_t_fruits();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Inheritance 3.cpp b/30. CPP Programs/Inheritance 3.cpp
new file mode 100644
index 0000000..8105f4f
--- /dev/null
+++ b/30. CPP Programs/Inheritance 3.cpp	
@@ -0,0 +1,48 @@
+#include<iostream>
+using namespace std;
+class shape
+{
+    protected:
+                float width,height;
+    public:
+                shape()
+                {
+                    cout<<"Enter the value of width: "<<endl;
+                    cin>>width;
+                    cout<<"Enter the value of height: "<<endl;
+                    cin>>height;
+                }
+};
+class rectangle: public shape
+{
+    private:    
+                float ar;
+    public:
+                void area_rec()
+                {
+                    ar = height * width;
+                    cout<<"The area of rectangle is: "<<ar<<endl;
+                }
+};
+class triangle: public shape
+{
+    private:
+                float ar;
+    public:
+                void area_tri()
+                {
+                    ar = 0.5 * height * width;
+                    cout<<"The area of triangle is: "<<ar<<endl;
+                }
+
+};
+int main()
+{
+    cout<<"FOR TRIANGLE"<<endl;
+    triangle obj;
+    obj.area_tri();
+    cout<<"FOR RECTANGLE"<<endl;
+    rectangle ob;
+    ob.area_rec();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Inheritance 4.cpp b/30. CPP Programs/Inheritance 4.cpp
new file mode 100644
index 0000000..a418229
--- /dev/null
+++ b/30. CPP Programs/Inheritance 4.cpp	
@@ -0,0 +1,24 @@
+#include<iostream>
+using namespace std;
+class Mother
+{
+    public:
+            void display()
+            {
+                cout<<"I am mother"<<endl;
+            }
+};
+class Daughter:public Mother
+{
+    public:
+            void display()
+            {
+                cout<<"I am daughter"<<endl;
+            }
+};
+int main()
+{
+    Daughter ob;
+    ob.display();
+    return 0;
+}
diff --git a/30. CPP Programs/Inheritance 5.cpp b/30. CPP Programs/Inheritance 5.cpp
new file mode 100644
index 0000000..ae5362f
--- /dev/null
+++ b/30. CPP Programs/Inheritance 5.cpp	
@@ -0,0 +1,40 @@
+#include<iostream>
+using namespace std;
+class Animal
+{
+   private:
+            string name;
+            int age;
+    public:
+            void set_value()
+            {
+                cout<<"Enter name: "<<endl;
+                getline(cin,name);
+                cout<<"Enter age: "<<endl;
+                cin>>age;
+            }
+            void display()
+            {
+                cout<<"The age is: "<<age<<endl;
+                cout<<"Name is: "<<name<<endl;
+                if(name=="zebra"||name=="Zebra")
+                {
+                    cout<<"The origin is Africa"<<endl;
+                    cout<<"The color is black and white"<<endl;
+                }
+                else if(name=="dolphin"||name=="Dolphin")
+                {
+                    cout<<"The origin is Miocene Epoch"<<endl;
+                    cout<<"The color is whitish-grey"<<endl;
+                }
+                else
+                cout<<"Incorrect input";
+            }
+};
+int main()
+{
+    Animal ob;
+    ob.set_value();
+    ob.display();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Linked_List.cpp b/30. CPP Programs/Linked_List.cpp
new file mode 100644
index 0000000..95d92d6
--- /dev/null
+++ b/30. CPP Programs/Linked_List.cpp	
@@ -0,0 +1,354 @@
+/* Name - Satyam Gupta
+    Roll no -32
+    CST
+    LINKED LIST*/
+#include <iostream>
+using namespace std;
+
+class LinkedList
+{
+private:
+    typedef struct node
+    {
+        int info;
+        struct node *next;
+    } nodetype;
+
+    typedef struct NODE
+    {
+        struct NODE *prev;
+        int info;
+        struct NODE *next;
+    } NODE;
+
+    nodetype *first = NULL, *last = NULL;
+    NODE *f = NULL, *l = NULL;
+    int len = 0;
+
+public:
+    void single_create()
+    {
+        int x;
+        nodetype *p = NULL;
+        p = new nodetype();
+        cout << "Enter value : ";
+        cin >> x;
+        p->info = x;
+
+        if (first == NULL && last == NULL)
+        {
+            first = last = p;
+        }
+        else
+        {
+            last->next = p;
+            last = p;
+        }
+        last->next = NULL;
+        len++;
+    }
+    void single_delete(int pos)
+    {
+        nodetype *p = new nodetype();
+        nodetype *q = new nodetype();
+        if (pos <= len)
+        {
+            q = first;
+            if (pos == 1)
+            {
+                first = first->next;
+                cout << q->info << " is deleted." << endl;
+                free(q);
+            }
+            else if (pos == len)
+            {
+                while (q != NULL)
+                {
+                    p = q;
+                    q->next;
+                }
+                cout << q->info << " node is deleted." << endl;
+                last = p;
+                p->next = NULL;
+                free(q);
+            }
+            else
+            {
+                for (int i = 0; i < pos - 1; i++)
+                {
+                    p = q;
+                    q = q->next;
+                }
+                cout << q->info << " node is deleted." << endl;
+                p->next = q->next;
+                p = q->next;
+                free(q);
+            }
+        }
+        else
+        {
+            cout << "Position does not exist." << endl;
+        }
+    }
+    void single_display()
+    {
+        nodetype *p = new nodetype();
+        p = first;
+        while (p != NULL)
+        {
+            cout << p->info << "\t";
+            p = p->next;
+        }
+        cout << endl;
+    }
+
+    void circular_create()
+    {
+        int x;
+        nodetype *p = new nodetype();
+        cout << "Enter Value : ";
+        cin >> x;
+        p->info = x;
+        if (first == NULL && last == NULL)
+        {
+            first = last = p;
+        }
+        else
+        {
+            last->next = p;
+            last = p;
+        }
+        last->next = first;
+        len++;
+    }
+    void circular_delete(int pos)
+    {
+        nodetype *p = new nodetype();
+        nodetype *q = new nodetype();
+        if (pos <= len)
+        {
+            q = first;
+            if (pos == 1)
+            {
+                cout << q->info << " node is deleted." << endl;
+                first = q->next;
+                last->next = q->next;
+                free(q);
+            }
+            else if (pos == len)
+            {
+                do
+                {
+                    p = q;
+                    q = q->next;
+                } while (q != first);
+                cout << q->info << " node is deleted." << endl;
+                last = p;
+                p->next = q->next;
+                free(q);
+            }
+            else
+            {
+                for (int i = 0; i < pos - 1; i++)
+                {
+                    p = q;
+                    q = q->next;
+                }
+                cout << q->info << " node is deleted." << endl;
+                p->next = q->next;
+                free(q);
+            }
+        }
+    }
+    void circular_display()
+    {
+        nodetype *p = new nodetype();
+        p = first;
+        do
+        {
+            cout << p->info << "\t";
+            p = p->next;
+        } while (p != first);
+        cout << endl;
+    }
+    void doubly_create()
+    {
+        int x;
+        NODE *p = new NODE();
+        cout << "Enter Value : ";
+        cin >> x;
+        p->info = x;
+        if (f == NULL && l == NULL)
+        {
+            f = l = p;
+            f->prev = NULL;
+        }
+        else
+        {
+            l->next = p;
+            p->prev = l;
+            l=p;
+        }
+        l->next = NULL;
+        len++;
+    }
+
+    void doubly_delete(int pos)
+    {
+        NODE *p = new NODE();
+        NODE *q = new NODE();
+        NODE *r= new NODE();
+        if (pos <= len)
+        {
+            q = f;
+            if (pos == 1)
+            {
+                cout << q->info << " node is deleted." << endl;
+                f = f->next;
+                f->prev = NULL;
+                free(q);
+            }
+            else if (pos == len)
+            {
+                while (q != NULL)
+                {
+                    p = q;
+                    q = q->next;
+                }
+                cout << q->info << " node is deleted." << endl;
+                l = p;
+                p->next = NULL;
+                free(q);
+            }
+            else
+            {
+                for(int i=0;i<pos-1;i++)
+                {
+                    p=q;
+                    q=q->next;
+                }
+                r=q->next;
+                cout<<q->info<<" node is deleted."<<endl;
+                p->next=q->next;
+                r->prev=p;
+                free(q);
+            }
+        }
+        else{
+            cout<<"Position does not exist"<<endl;
+        }
+    }
+
+    void doubly_display()
+    {
+        NODE *p = new NODE();
+        p = f;
+        while (p != NULL)
+        {
+            cout << p->info << "\t";
+            p = p->next;
+        }
+        cout << endl;
+    }
+};
+
+int main()
+{
+    LinkedList L1;
+    int ch, ch1;
+    int pos;
+
+    cout << "1.Singley Linked List\n2.Circular Linked List\n3.Doubley Linked List" << endl;
+    cout << "Enter your choice : ";
+    cin >> ch;
+    switch (ch)
+    {
+    case 1:
+        while (1)
+        {
+            cout << "1.Create\n2.Delete node\n3.Display\n4.Exit" << endl;
+            cin >> ch1;
+            switch (ch1)
+            {
+            case 1:
+                L1.single_create();
+                break;
+            case 2:
+                cout << "Enter position of node to delete :";
+                cin >> pos;
+                L1.single_delete(pos);
+            case 3:
+                L1.single_display();
+                break;
+            case 4:
+                return 0;
+                break;
+            default:
+                cout << "Entered wrong choice ." << endl;
+                break;
+            }
+        }
+        break;
+
+    case 2:
+        while (1)
+        {
+            cout << "1.Create\n2.Delete node\n3.Display\n4.Exit" << endl;
+            cin >> ch1;
+            switch (ch1)
+            {
+            case 1:
+                L1.circular_create();
+                break;
+            case 2:
+                cout << "Enter position of node to delete :";
+                cin >> pos;
+                L1.circular_delete(pos);
+                break;
+            case 3:
+                L1.circular_display();
+                break;
+            case 4:
+                return 0;
+                break;
+            default:
+                cout << "Entered wrong choice ." << endl;
+                break;
+            }
+        }
+        break;
+
+    case 3:
+        while (1)
+        {
+            cout << "1.Create\n2.Delete node\n3.Display\n4.Exit" << endl;
+            cin >> ch1;
+            switch (ch1)
+            {
+            case 1:
+                L1.doubly_create();
+                break;
+                case 2:
+                 cout << "Enter position of node to delete :";
+                cin >> pos;
+                L1.doubly_delete(pos);
+                break;
+            case 3:
+                L1.doubly_display();
+                break;
+            case 4:
+                return 0;
+                break;
+            default:
+                cout << "Entered wrong choice ." << endl;
+                break;
+            }
+        }
+        break;
+    default:
+        cout << "Entered wrong choice." << endl;
+        break;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Queue.cpp b/30. CPP Programs/Queue.cpp
new file mode 100644
index 0000000..9f3b4c4
--- /dev/null
+++ b/30. CPP Programs/Queue.cpp	
@@ -0,0 +1,291 @@
+/* Name - Satyam Gupta
+    Roll no -32
+    CST
+    QUEUE*/
+#include <iostream>
+#define MAX 10
+using namespace std;
+
+class Queue
+{
+private:
+    int queue[MAX], rear, front, x, *dyn = NULL, dyn_size;
+
+public:
+    Queue()
+    {
+        rear = -1;
+        front = -1;
+    }
+
+    void stat_enqueue()
+    {
+        if (rear == MAX - 1)
+        {
+            cout << "Queue is overflow." << endl;
+        }
+        else if (front == -1 && rear == -1)
+        {
+            rear++;
+            cout << "Enter the value : ";
+            cin >> x;
+            queue[rear] = x;
+            front++;
+        }
+        else
+        {
+            rear++;
+            cout << "Enter the value : ";
+            cin >> x;
+            queue[rear] = x;
+        }
+    }
+
+    void stat_dequeue()
+    {
+        if (front == -1 &&rear==-1)
+        {
+            cout << "Queue is underflow." << endl;
+        }
+        else if (front == rear)
+        {
+            cout << queue[front] << " element is dequeued." << endl;
+            front = rear = -1;
+        }
+        else
+        {
+            cout << queue[front] << " element is dequeued." << endl;
+            front++;
+        }
+    }
+
+    void stat_display()
+    {
+        int temp=front;
+        if (front == -1)
+        {
+            cout << "Queue is underflow";
+        }
+        else
+        {
+            cout << "Queue :-" << endl;
+            while (temp<=rear)
+            {
+                cout<<queue[temp]<<"\t";
+                temp++;
+            }
+            cout << endl;
+        }
+    }
+
+    void getdyn_size()
+    {
+        cout << "Enter size of queue : ";
+        cin >> dyn_size;
+        dyn = new int[dyn_size];
+    }
+    void dyn_enqueue()
+    {
+        if (rear == dyn_size - 1)
+        {
+            cout << "Queue is overflow." << endl;
+        }
+        else if (front == -1 && rear == -1)
+        {
+            rear++;
+            cout << "Enter the value : ";
+            cin >> x;
+            *(dyn+rear)=x;
+            front++;
+        }
+        else
+        {
+            rear++;
+            cout << "Enter the value : ";
+            cin >> x;
+            *(dyn+rear) = x;
+        }
+    }
+
+    void dyn_dequeue()
+    {
+        if (front == -1 || front > rear)
+        {
+            cout << "Queue is underflow." << endl;
+        }
+        else if (front == rear)
+        {
+            cout << *(dyn+front)<< " element is dequeued." << endl;
+            front = rear = -1;
+        }
+        else
+        {
+            cout << *(dyn+front) << " element is dequeued." << endl;
+            front++;
+        }
+    }
+
+    void dyn_display()
+    {
+        int temp=front;
+        if (front == -1&&rear==-1)
+        {
+            cout << "Queue is underflow." << endl;
+        }
+        else
+        {
+             cout<<"Queue :-"<<endl;
+             while(temp<=rear)
+             {
+                 cout<<*(dyn+temp)<<"\t";
+                 temp++;
+             }
+             cout<<endl;
+        }
+    }
+
+    void circular_enqueue()
+    {
+        if ((rear + 1) % dyn_size == front)
+        {
+            cout << "Queue is overflow." << endl;
+        }
+        else
+        {
+            rear = (rear + 1) % dyn_size;
+            cout << "Enter the value : ";
+            cin >> x;
+            *(dyn+rear)= x;
+            if(front==-1)
+            front=rear;
+        }
+    }
+
+    void circular_dequeue()
+    {
+        if(front==-1&&rear==-1)
+        {
+            cout<<"Queue is underflow."<<endl;
+        }
+        else if (front == rear)
+        {
+			cout<<*(dyn+front)<<" element is dequeued."<<endl;
+			front=rear=-1;
+        }
+        else
+        {
+            cout <<*(dyn+front) << " element is dequeued." << endl;
+            front = (front + 1) % dyn_size;
+        }
+    }
+
+    void circular_display()
+    {
+        int temp=front;
+        if(front==-1&&rear==-1)
+        {
+            cout<<"Queue is underflow."<<endl;
+        }
+        else
+        {
+           while (temp!=rear)
+           {
+               cout<<*(dyn+temp)<<"\t";
+               temp=(temp+1)%dyn_size;
+           }
+           cout<<*(dyn+temp)<<"\t";
+        }
+        cout<<endl;
+    }
+};
+int main()
+{
+    Queue q1;
+    int ch, ch1;
+    cout << "1.Static Queue\n2.Dynamic Queue\n3.Circular Queue." << endl;
+    cout << "Enter your choice : ";
+    cin >> ch;
+    switch (ch)
+    {
+    case 1:
+        while (1)
+        {
+            cout << "1.Enqueue\n2.Dequeue\n3.Display\n4.Exit" << endl;
+            cout << "Enter choice : ";
+            cin >> ch1;
+            switch (ch1)
+            {
+            case 1:
+                q1.stat_enqueue();
+                break;
+            case 2:
+                q1.stat_dequeue();
+                break;
+            case 3:
+                q1.stat_display();
+                break;
+            case 4:
+                return 0;
+
+            default:
+                cout << "Entered wrong choice." << endl;
+                break;
+            }
+        }
+        break;
+
+    case 2:
+        q1.getdyn_size();
+        while (1)
+        {
+            cout << "1.Enqueue\n2.Dequeue\n3.Display\n4.Exit" << endl;
+            cout << "Enter choice : ";
+            cin >> ch1;
+            switch (ch1)
+            {
+            case 1:
+                q1.dyn_enqueue();
+                break;
+            case 2:
+                q1.dyn_dequeue();
+                break;
+            case 3:
+                q1.dyn_display();
+                break;
+            case 4:
+                return 0;
+            default:
+                cout << "Entered wrong choice." << endl;
+                break;
+            }
+        }
+    case 3:
+        q1.getdyn_size();
+        while (1)
+        {
+            cout << "1.Enqueue\n2.Dequeue\n3.Display\n4.Exit" << endl;
+            cout << "Enter choice : ";
+            cin >> ch1;
+            switch (ch1)
+            {
+            case 1:
+                q1.circular_enqueue();
+                break;
+            case 2:
+                q1.circular_dequeue();
+                break;
+            case 3:
+                q1.circular_display();
+                break;
+            case 4:
+                return 0;
+            default:
+                cout << "Entered wrong choice." << endl;
+                break;
+            }
+        }
+    default:
+        cout << "Entered wrong choice." << endl;
+        break;
+    }
+}
\ No newline at end of file
diff --git a/30. CPP Programs/Test.cpp b/30. CPP Programs/Test.cpp
new file mode 100644
index 0000000..027d5a2
--- /dev/null
+++ b/30. CPP Programs/Test.cpp	
@@ -0,0 +1,42 @@
+#include<iostream>
+using namespace std;
+class Test
+{
+    private: 
+                int n1,n2,n3;
+    public: 
+                void setvalue(int a,int b,int c)
+                {
+                    n1=a;
+                    n2=b;
+                    n3=c;
+                }    
+    friend void biggest(Test);
+};
+void biggest(Test ob)
+{
+    int n=ob.n1;
+    if(ob.n1>=ob.n2)
+    {
+        if(ob.n1>=ob.n3)
+        cout<<"The biggest number is: "<<ob.n1;
+        else
+        cout<<"The biggest number is: "<<ob.n3;
+    }
+    else
+    {
+        if(ob.n2>=ob.n3)
+        cout<<"The biggest number is: "<<ob.n2;
+        else
+        cout<<"The biggest number is: "<<ob.n3;
+    }
+}
+
+int main()
+{
+    Test ob;
+    ob.setvalue(1,7,5);
+    biggest(ob);
+    return 0;
+}
+
diff --git a/30. CPP Programs/bank.cpp b/30. CPP Programs/bank.cpp
new file mode 100644
index 0000000..9949fa5
--- /dev/null
+++ b/30. CPP Programs/bank.cpp	
@@ -0,0 +1,57 @@
+#include<iostream>
+#include<stdio.h>
+using namespace std;
+class Bank
+{
+    private:   string name;
+               string address;
+                int accno,bal,arr[1000],c=0;
+    public:    int input(int n)
+                {
+                     c+=arr[n];
+                    cout<<"Enter Name"<<endl;
+                    getline(cin,name);
+                    cout<<"Enter Address"<<endl;
+                    getline(cin,address);
+                    if(accno<=1000)
+                    {
+                        cout<<"Enter Account number(Starting=1001)"<<endl;
+                        cin>>accno;
+                    }
+                    else
+                    {
+                        accno++;
+                        cout<<accno;
+                    }
+                    cout<<"Enter Balance amount"<<endl;
+                    cin>>bal;
+                    return accno;
+                } 
+                void print(int n)
+                {  
+                    if(n==accno)
+                    {
+                    cout<<"Name = "<<name;
+                    cout<<"Address = "<<address;
+                    cout<<"Account number = "<<n;
+                    cout<<"Balance amount = "<<bal;
+                    }
+                }
+
+};
+
+int main()
+{
+    Bank ob;
+    int n,accno,faccno;
+    cout<<"Enter no of users"<<endl;
+    cin>>n;
+    for(int i=0;i<=n;i++)
+    {
+    accno=ob.input(n);
+    }
+    cout<<"Enter the account number to find"<<endl;
+    cin>>faccno;
+    ob.print(faccno);
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/inheritance 1.cpp b/30. CPP Programs/inheritance 1.cpp
new file mode 100644
index 0000000..20a45f8
--- /dev/null
+++ b/30. CPP Programs/inheritance 1.cpp	
@@ -0,0 +1,37 @@
+#include<iostream>
+using namespace std;
+class Mammals
+{
+public:
+        void display1()
+        {
+            cout<<"I am mammal"<<endl;
+        }
+};class MarineAnimals
+{
+public:
+        void display2()
+        {
+            cout<<"I am a Marine Animal"<<endl;
+        }
+};
+class BlueWhale:public Mammals,public MarineAnimals
+{
+public:
+        void display()
+        {
+            cout<<"I belong to both the categories: Mammals as well as Marine Animals"<<endl;
+        }
+};
+int main()
+{
+    Mammals obm;
+    MarineAnimals obma;
+    BlueWhale obbw;
+    obm.display1();
+    obma.display2();
+    obbw.display();
+    obbw.display1();
+    obbw.display2();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/product.cpp b/30. CPP Programs/product.cpp
new file mode 100644
index 0000000..caade30
--- /dev/null
+++ b/30. CPP Programs/product.cpp	
@@ -0,0 +1,55 @@
+#include<iostream>
+using namespace std;
+class PRODUCT
+{
+    private: 
+                string Pid;
+                string Pname;
+                string remarks;
+                int Pcostprice,Psellingprice,margin;
+    public: 
+                void setRemarks(int sp,int cp)
+                {
+                    margin=(sp-cp);
+                    if(margin<0)
+                        remarks = "Loss";
+                    else if(margin>0)
+                        remarks = "Profit";
+                }
+                void Getdetials()
+                {
+                    cout<<"Enter Product ID"<<endl;
+                    getline(cin,Pid);
+                    cout<<"Enter Product name"<<endl;
+                    getline(cin,Pname);
+                    cout<<"Enter Cost Price"<<endl;
+                    cin>>Pcostprice;
+                    cout<<"Enter Selling Price"<<endl;
+                    cin>>Psellingprice;
+                    setRemarks(Psellingprice,Pcostprice);
+                    cin.clear();
+                    cin.sync();
+                }
+                void Setdetails()
+                {
+                    cout<<"Product ID = "<<Pid<<endl;
+                    cout<<"Product Name = "<<Pname<<endl;
+                    cout<<"Cost price = "<<Pcostprice<<endl;
+                    cout<<"Selling price = "<<Psellingprice<<endl;
+                    cout<<"Remarks = "<<remarks<<endl;
+                }
+
+};
+int main()
+{
+    PRODUCT ob[5];
+    int i;
+    for(i=1;i<=5;i++)
+    {
+        cout<<"Enter the details of "<<i<<" product"<<endl;
+        ob[i].Getdetials();
+        cout<<"The details about "<<i<<" product"<<endl;
+        ob[i].Setdetails();
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/sorting.cpp b/30. CPP Programs/sorting.cpp
new file mode 100644
index 0000000..81547e1
--- /dev/null
+++ b/30. CPP Programs/sorting.cpp	
@@ -0,0 +1,146 @@
+/* Name - Satyam Gupta
+    Roll no -32
+    CST
+    SORTING*/
+
+#include <iostream>
+#define MAX 100
+using namespace std;
+
+class sorting
+{
+    int a[MAX], lb=0,ub=n-1;
+
+public:
+int n;
+    void get()
+    {
+        cout << "Enter size of array : ";
+        cin >> n;
+        cout << "Enter the elements of array : " << endl;
+        for (int i = 0; i < n; i++)
+            cin >> a[i];
+    }
+
+    void BubbleSort()
+    {
+        int temp = 0;
+        for (int i = 0; i < n - 1; i++)
+        {
+            for (int j = 0; j < n - 1 - i; j++)
+            {
+                if (a[j] > a[j + 1])
+                {
+                    temp = a[j];
+                    a[j] = a[j + 1];
+                    a[j + 1] = temp;
+                }
+            }
+        }
+    }
+
+    void sel_sort()
+    {
+        int pos, min = 0;
+
+        for (int i = 0; i < n - 1; i++)
+        {
+            min = a[i];
+            pos = i;
+            for (int j = i + 1; j < n; j++)
+            {
+                if (min > a[j])
+                {
+                    min = a[j];
+                    pos = j;
+                }
+            }
+            if (pos != i)
+            {
+                a[pos] = a[i];
+                a[i] = min;
+            }
+        }
+    }
+
+    void InsertionSort()
+    {
+        int i, j, temp = 0;
+        for (i = 1; i < n; i++)
+        {
+            temp = a[i];
+            j = i - 1;
+            while (j >= 0 && temp < a[j])
+            {
+                a[j + 1] = a[j];
+                j--;
+            }
+            a[j + 1] = temp;
+        }
+    }
+
+    void quick_sort(int lb, int ub)
+    {
+        int i = lb, j = ub, key = a[lb], temp = 0;
+        if (lb >= ub)
+            return;
+        while (i < j)
+        {
+            while (key >a[i] && i < j)
+                i++;
+            while (key < a[j])
+                j--;
+            if (i < j)
+            {
+                temp = a[i];
+                a[i] = a[j];
+                a[j] = temp;
+            }
+        }
+        quick_sort(lb,j-1);
+        quick_sort(j+1,ub);
+    }
+
+    void display()
+    {
+        for (int i = 0; i < n; i++)
+            cout << a[i] << "\t";
+    }
+};
+
+int main()
+{
+    int ch;
+    sorting s1;
+    s1.get();
+    cout << "Array before sorting : " << endl;
+    s1.display();
+    cout<<endl;
+    cout << "1.Bubble sort \n2.Selection Sort \n3.Insertion Sort\n4.Quick Sort\n5.Exit" << endl;
+    cout << "Enter valid choice : " << endl;
+    cin >> ch;
+
+    switch (ch)
+    {
+    case 1:
+        s1.BubbleSort();
+        break;
+    case 2:
+        s1.sel_sort();
+        break;
+    case 3:
+        s1.InsertionSort();
+        break;
+        case 4:
+        s1.quick_sort(0,(s1.n)-1);
+        break;
+        case 5:
+        return 0;
+    default:
+        cout << "Entered choice is wrong" << endl;
+        break;
+    }
+    cout << "Array after sorting : " << endl;
+    s1.display();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/stack.cpp b/30. CPP Programs/stack.cpp
new file mode 100644
index 0000000..8f222d7
--- /dev/null
+++ b/30. CPP Programs/stack.cpp	
@@ -0,0 +1,200 @@
+/* Name - Satyam Gupta
+    Roll no -32
+    CST
+    STACK*/
+#include<iostream>
+#define MAX 10
+using namespace std;
+class stack
+{
+private:
+    int arr[MAX], top, *d = NULL, d_size;
+
+public:
+    stack()
+    {
+        top = -1;
+    }
+    void push()
+    {
+        if (top == MAX - 1)
+        {
+            cout << "Stack is full." << endl;
+        }
+        else
+        {
+            top++;
+            cout << "Enter element in stack : ";
+            cin >> arr[top];
+        }
+    }
+    void pop()
+    {
+        if (top == -1)
+        {
+            cout << "Stack is empty." << endl;
+        }
+        else
+        {
+            cout << arr[top] << " is deleted." << endl;
+            top--;
+        }
+    }
+    void peek()
+    {
+        if (top == -1)
+        {
+            cout << "Stack is empty." << endl;
+        }
+        else
+        {
+            cout << "Top element of stack is " << arr[top] << "." << endl;
+        }
+    }
+    void display()
+    {
+        if (top == -1)
+            cout << "Stack is empty." << endl;
+        else
+        {
+            for (int i = top; i > -1; i--)
+            {
+                cout << arr[i] << "\t";
+            }
+            cout << endl;
+        }
+    }
+
+    void dyn_size()
+    {
+        cout << "Enter the size of stack : ";
+        cin >> d_size;
+
+        d = new int[d_size];
+    }
+    void dyn_push()
+    {
+        if (top == d_size - 1)
+        {
+            cout << "Stack is full." << endl;
+        }
+        else
+        {
+            top++;
+            cout << "Enter element in stack : ";
+            cin >> *(d + top);
+        }
+    }
+    void dyn_pop()
+    {
+        if (top == -1)
+        {
+            cout << "Stack is empty." << endl;
+        }
+        else
+        {
+            cout << *(d + top) << " is deleted." << endl;
+            top--;
+        }
+    }
+    void dyn_peek()
+    {
+        if (top == -1)
+        {
+            cout << "Stack is empty." << endl;
+        }
+        else
+        {
+            cout << *(d + top) << "is top element in stack" << endl;
+        }
+    }
+    void dyn_display()
+    {
+        if (top == -1)
+        {
+            cout << "Stack is empty." << endl;
+        }
+        else
+        {
+            for (int i = top; i > -1; i--)
+            {
+                cout << *(d + i) << "\t";
+            }
+            cout << endl;
+        }
+    }
+};
+int main()
+{
+    stack s1;
+    int ch, x;
+    cout << "1.Static Stack\n2.Dynamic Stack\n3.Exit" << endl;
+    cout << "Enter choice : ";
+    cin >> ch;
+    switch (ch)
+    {
+    case 1:
+        while (1)
+        {
+            cout << "1.Push an element\n2.Pop an element\n3.Peek\n4.Display\n5.Exit" << endl;
+            cout << "Enter valid choice : ";
+            cin >> x;
+            switch (x)
+            {
+            case 1:
+                s1.push();
+                break;
+            case 2:
+                s1.pop();
+                break;
+            case 3:
+                s1.peek();
+                break;
+            case 4:
+                s1.display();
+                break;
+            case 5:
+                return 0;
+            default:
+                cout << "Enetred choice is wrong" << endl;
+                break;
+            }
+        }
+        break;
+    case 2:
+        s1.dyn_size();
+        while (1)
+        {
+            cout << "1.Push an element\n2.Pop an element\n3.Peek\n4.Display\n5.Exit" << endl;
+            cout << "Enter valid choice : ";
+            cin >> x;
+            switch (x)
+            {
+            case 1:
+                s1.dyn_push();
+                break;
+            case 2:
+                s1.dyn_pop();
+                break;
+            case 3:
+                s1.dyn_peek();
+                break;
+            case 4:
+                s1.dyn_display();
+                break;
+            case 5:
+                return 0;
+            default:
+                cout << "Enetred choice is wrong" << endl;
+                break;
+            }
+        }
+        break;
+    case 3:
+        return 0;
+
+    default:
+        cout << "Entered wrong choice" << endl;
+        break;
+    }
+}
\ No newline at end of file
diff --git a/30. CPP Programs/student.cpp b/30. CPP Programs/student.cpp
new file mode 100644
index 0000000..aa8c7ac
--- /dev/null
+++ b/30. CPP Programs/student.cpp	
@@ -0,0 +1,47 @@
+#include<iostream>
+using namespace std;
+class Student
+{
+    private:    string Name;
+                int roll;
+                float s1,s2,s3,per;
+    public:     void Inputinfo()
+                {
+                    cout<<"enter name"<<endl;
+                    getline(cin,Name);
+                    cout<<"enter roll"<<endl;
+                    cin>>roll;
+                    cout<<"enter marks in 3 subjects"<<endl;
+                    cin>>s1>>s2>>s3;
+                }
+                void CalcPercentage()
+                {
+                    per=((s1+s2+s3)/3);
+                    if(per>=90&&per<=100)
+                    cout<<"Grade A";
+                    else if(per>=80&&per<90)
+                    cout<<"Grade B";
+                    else if(per>=60&&per<80)
+                    cout<<"Grade C";
+                    else if(per>=40&&per<60)
+                    cout<<"Grade D";
+                    else 
+                    cout<<"Grade F";
+                }
+                void DisplayInfo()
+                {
+                    cout<<endl;
+                    cout<<Name<<endl;
+                    cout<<roll<<endl;
+                    cout<<s1<<s2<<s3<<endl;
+                
+                }
+};
+int main()
+{
+    Student ob;
+    ob.Inputinfo();
+    ob.CalcPercentage();
+    ob.DisplayInfo();
+    return 0;
+}
\ No newline at end of file
diff --git a/30. CPP Programs/tollbooth.cpp b/30. CPP Programs/tollbooth.cpp
new file mode 100644
index 0000000..23b7691
--- /dev/null
+++ b/30. CPP Programs/tollbooth.cpp	
@@ -0,0 +1,57 @@
+#include<iostream>
+using namespace std;
+class TollBooth
+{
+    private:
+                unsigned int cars;
+                double amount;
+    public:
+                void setvalue()
+                {
+                    cars=0;
+                    amount=0;
+                }
+                void PayingCar()
+                {
+                    cars++;
+                    amount+=0.5;
+                }
+                void nonPayCar()
+                {
+                    cars++;
+                }
+                void Display()
+                {
+                    cout<<"total number of cars = "<<cars<<endl;
+                    cout<<"Total cash = "<<amount;
+                }
+};
+int main()
+{
+    TollBooth ob;
+    int i;
+    char c;
+    ob.setvalue();
+    do
+    {
+    cout<<"Enter the key"<<endl;
+    cout<<"A. Paying Car"<<endl;
+    cout<<"B. non Paying car"<<endl;
+    cout<<"E. Display the total"<<endl;
+    cin>>c;
+    switch(c)
+    {
+        case 'A': ob.PayingCar();
+                    i++;
+                    break;
+        case 'B': ob.nonPayCar();
+                    i++;
+                    break;
+        case 'E': ob.Display();
+                    i=0;
+                    break;
+        default: cout<<"Invalid choice";
+    }
+    }while(i!=0);
+    return 0;
+}
\ No newline at end of file