update

csci124/asgn2/customerHandler.cpp

@@ -0,0 +1,251 @@
+//Author	: Lim Chee Yeong
+//Student ID: J14016414(INTI) or 4933643(UOW)
+//Class		: CSCI124
+//Assignment: 2
+//Date		: Sept 23rd, 2014
+#include <cstdio>
+#include <cmath>
+#include "customerHandler.h"
+//add new customer into the file
+void addCustomer(char file[]){
+	customer cust; //create a struct to store data temporarily
+	//prompt user to imput the id they wanted to add
+	cout << endl << "Adding new customer," << endl;
+	cout << "Customer ID: ";
+	cin >> cust.id;
+	cin.ignore();
+
+	//initialize require items to check whether the id is available in the binary file
+	bool found = false; //for checking purpose
+	int id; //to store id from binary file for comparison
+	ifstream bin(file, ios::binary); //open file in binary mode
+	bin.seekg(0, ios::beg); //set the location point to the beginning of the file
+	//when the binary file is without eofbit or other bit, 
+	//read id from file to int id, and compare it to cust.id
+	while(bin.good()){
+		bin.read((char*)&id, sizeof(int));
+		if(id == cust.id){
+			found = true;
+			break;
+		}
+		bin.seekg(sizeof(customer)-sizeof(int), ios::cur); //move the location point to next record
+	}
+	bin.close(); //close  binary file
+
+	//if the id is found to be same, tell user that the id is exist, else perform add new customer
+	if(found == true){
+		cout << "ID is already exist in the system." << endl;
+	} else {
+		//get all required data from user
+		cout << "First Name: ";
+		cin.getline(cust.firstName, 14);
+		cout << "Last Name: ";
+		cin >> cust.lastName;
+		cout << "Loan Amount: RM";
+		cin >> cust.amount;
+		cout << "Duration of payment(month): ";
+		cin >> cust.duration;
+		do{
+			cout << "Interest rates: ";
+			cin >> cust.interest;
+		}while(cust.interest > 100); //interest rates must not greater than 100%
+		do{
+			cout << "Total paid amount: RM";
+			cin >> cust.totalPaid;
+		}while(cust.totalPaid > cust.amount); //paid amount must not greater than loan amount
+
+		ofstream bin(file, ios::app | ios::binary); //open file in append mode, for adding record 
+		bin.write((char*)&cust, sizeof(customer)); //add record into it
+		bin.close(); //close file
+	}
+}
+//add monthly payment to particular customer
+void modifyCustomer(char file[]){
+	//prompt user to input id
+	int id;
+	cout << endl << "Customer payment portal," << endl;
+	cout << "Customer ID: ";
+	cin >> id;
+
+	//for checking the id from binary file
+	int found = -1; 
+	int location = 0;
+	ifstream bin(file, ios::binary); //open binary files
+	bin.seekg(0, ios::beg); //set location to begining of file
+	customer cust; // create a struct to store data temporarily
+	while(bin.good()){
+		location = bin.tellg(); // save the location of the record
+		//cout << location; // to see the location
+		bin.read((char*)&cust, sizeof(customer)); //read data from file to struct
+		//set found to true if the user input id same as the id in file, then break out of the loop
+		if(id == cust.id){
+			found = 1;
+			break;
+		}
+	}
+	bin.close();
+	//when the customer paid bill is higher or equal to the customer loan, 
+	//customer don't have to pay anymore, back to menu.
+	if(cust.totalPaid >=cust.amount){
+		cout << "The customer had cleared the payment." << endl;
+		found = 0;
+	}
+
+	//when it found, perform modify action, if not found then print out customer not found
+	if(found == 1){
+		//print out the customer details
+		cout << endl << "\tCustomer Details" << endl;
+		cout << "Customer ID:\t" << cust.id << endl
+			<< "Customer Name:\t" << cust.firstName << " " << cust.lastName << endl
+			<< "Loan Amount:\tRM" << cust.amount << endl
+			<< "Loan Period:\t" << cust.duration << "(months)" << endl
+			<< "Interest Rate:\t" << cust.interest << "\%" << endl
+			<< "Paid Amount:\tRM" << cust.totalPaid << endl
+			<< "Outstanding:\tRM" << cust.amount - cust.totalPaid << endl;
+		//declare and calculate the monthly payment
+		float ratem = cust.interest / 1200.00;
+		//cout << ratem << endl; //to see the value of ratem
+		float expm = 1.0 + ratem;
+		//cout << expm << endl; //to see the value of expm
+		float monthlyPayment = (ratem * pow(expm, cust.duration) * cust.amount) / (pow(expm, cust.duration) - 1.0);
+
+		//prompt user to input the payment value, if payment less than expected payment, print out a warning
+		float pay;
+		char cont = 'Y';
+		//show the expected payment value
+		cout << "The customer have to pay RM" << monthlyPayment << "for this month." << endl;
+		do{
+			cont = 'Y';
+			cout << "Payment: RM";
+			cin >> pay; // request input from user
+			//warning user if payment less than expected payment
+			if(pay < 0){
+				cout << "Invalid payment!" << endl; //if payment less than 0, invalid
+			} else if(pay < monthlyPayment){
+				cout << "The payment is less than system requested monthly payment." << endl;
+				cout << "Continue?(Y/N): ";
+				cin >> cont;
+			}
+		}while(pay < 0 || cont == 'N' || cont == 'n');
+
+		cust.totalPaid += pay; // save the payment to total paid
+		fstream bin(file, ios::in | ios::out | ios::binary); //open file in update mode
+		bin.seekp(location, ios::beg); //set the location to respective customer
+		bin.write((char*)&cust, sizeof(customer)); //write the record
+		bin.close(); //close file
+	} 
+	//when the customer id can't be found in the binary file, print below statement
+	else if(found == -1) {
+		cout << "Customer not found!" << endl;
+	}
+}
+//display particular customer information, All paid customer or all unpaid customer
+void displayCustomer(char file[], int choice){
+	customer cust; //create a struct to store data temporarily
+	ifstream bin(file, ios::binary); //open binary file in input mode
+	bin.seekg(0, ios::beg); //set location at beginning of the file
+	if(choice == 1){
+		//declare id for user to choose the customer id which they wanted to display
+		int id; 
+		cout << "Customer ID: ";
+		cin >> id;
+
+		bool found = false; //for checking purpose, if not found, then print customer not found
+		while(bin.good()){
+			bin.read((char*)&cust, sizeof(customer));//read data from binary to struct
+			//if the cust.id found, set boolean to true and print out customer details
+			if(id == cust.id){
+				found = true; //set found to true if user founded
+				cout << endl << "\tCustomer Details" << endl;
+				cout << "Customer ID:\t" << cust.id << endl
+					<< "Customer Name:\t" << cust.firstName << " " << cust.lastName << endl
+					<< "Loan Amount:\tRM" << cust.amount << endl
+					<< "Loan Period:\t" << cust.duration << "(months)" << endl
+					<< "Interest Rate:\t" << cust.interest << "\%" << endl
+					<< "Paid Amount:\tRM" << cust.totalPaid << endl
+					<< "Outstanding:\tRM" << cust.amount - cust.totalPaid << endl;
+				break;
+			}
+		}
+		//if user doesn't found, print customer not found
+		if(found == false){
+			cout << "Customer ID not found!"<< endl;
+		}
+	}
+	//this part is to display customer that already paid all the loan
+	else if(choice == 2){
+		cout << "Customer cleared their loan," << endl;
+		cout << "ID\t" << "Customer Name\t" << "Loan(RM)" << endl;
+		cout << "--\t" << "-------------\t" << "--------" << endl;
+		while(bin.good()){
+			bin.read((char*)&cust, sizeof(customer)); //read data from binary file
+			if(!bin.eof()){
+				//if loan amount same as paid amount, print out the details
+				if(cust.amount <= cust.totalPaid){ 
+					cout << cust.id << "\t"
+						<< cust.firstName << " " << cust.lastName << "\t"
+						<< cust.amount << endl;
+				}
+			}
+		}
+	}
+	//this part is to display customer which still havent clean the loan
+	else if(choice == 3){
+		cout << "Customer haven't cleared their loan," << endl;
+		cout << "ID\t" << "Customer Name\t" << "Loan(RM)\t" << "Period " << "Outstanding(RM)" << endl;
+		cout << "--\t" << "-------------\t" << "--------\t" << "------ " << "---------------" << endl;
+		while(bin.good()){
+			bin.read((char*)&cust, sizeof(customer)); //read data from binary file
+			if(!bin.eof()){
+				//when loan amount is greater than paid amount, pring the customer data
+				if(cust.amount > cust.totalPaid){
+					cout << cust.id << "\t"
+						<< cust.firstName << " " << cust.lastName << "\t"
+						<< cust.amount << "\t\t"
+						<< cust.duration << "\t" 
+						<< cust.amount - cust.totalPaid << endl;
+				}
+			}
+		}
+	}
+	//this happen when user input is not 1 or 2 or 3
+	else{
+		cout << "Wrong input, back to menu." << endl;
+	}
+	bin.close(); //close the file
+}
+//perform delete a customer record function in the binary file
+void delCustomer(char file[]){
+	//declare id for user to input
+	int id;
+	cout << endl << "Delete customer record," << endl;
+	cout << "Customer ID: ";
+	cin >> id;
+
+	bool found = false; //for checking whether the customer id exist
+	ifstream bin(file, ios::binary); //open binary file in input mode
+	ofstream temp(".temp.bin", ios::app | ios::binary); //open temporary file in output append mode
+	bin.seekg(0, ios::beg); //set location point at the begining of binary file
+	customer cust;
+	while(bin.good()){
+		bin.read((char*)&cust, sizeof(customer));
+		if(!bin.eof()){
+			//when the user input id is different than the customer id, write it into temporary file
+			if(id != cust.id){
+				temp.write((char*)&cust, sizeof(customer));
+			}
+			//if founded the id, then dont write it into write and set boolean to true 
+			else if(id == cust.id) {
+				found = true;
+			}
+		}
+	}
+	//if customer id not found, print out the info
+	if(found != true)
+		cout << "Customer ID not found!" << endl;
+
+	temp.close(); //close temporary file
+	bin.close(); // close binary file
+	remove(file); // remove binary file
+	rename(".temp.bin", file); //rename temporary file to binary file name
+}

csci124/asgn2/customerHandler.h

@@ -0,0 +1,21 @@
+#include <iostream>
+#include <fstream>
+#include <cstring>
+
+using namespace std;
+
+//buffer struct to hold the data temporary
+struct customer{
+	int id;
+	char firstName[15];
+	char lastName[10];
+	double amount;
+	int duration;
+	float interest;
+	double totalPaid;
+};
+
+void addCustomer(char[]); //add new customer
+void modifyCustomer(char[]); //modify customer record
+void displayCustomer(char[], int); //display customer information
+void delCustomer(char[]); // delete particular customer information

csci124/asgn2/main.cpp

@@ -0,0 +1,70 @@
+//Author	: Lim Chee Yeong
+//Student ID: J14016414(INTI) or 4933643(UOW)
+//Class		: CSCI124
+//Assignment: 2
+//Date		: Sept 23rd, 2014
+//This is a driver program to provide a menu driven functionality
+//to call certain function to read, edit a binary file data of a bank customer
+
+#include "customerHandler.h" // include all bank function from the header files
+
+int main(){
+	//declare a file string for user to input the file they wanted to read from
+	char file[30];
+	cout << "Enter Filename: ";
+	cin >> file;
+	//For testing purpose, use the file below,
+	//strcpy(file, "example.bin");
+	//when the file not found in the system, terminate the program
+	ifstream bin(file, ios::binary);
+	if(!bin){
+		cout <<"File not found!" << endl;
+		return 0;
+	}
+	bin.close();
+
+	//an infinite loop to perform the menu functionality for the user to choose the option
+	int input;
+	while(true){
+		cout << endl << "\tBank Loan Information" << endl << endl;
+		cout << "1) Add Customer Record" << "\n"
+			<< "2) Display Customer Record" << "\n"
+			<< "3) Modify Customer Record" << "\n"
+			<< "4) Delete Customer Record" << "\n"
+			<< "0) Teminate Program" << endl;
+		cout << "Option: ";
+		cin >> input;
+		switch(input){
+			//add new customer into the file
+			case 1:
+				addCustomer(file);
+				break;
+			//display particular customer information, All paid customer or all unpaid customer
+			case 2:
+				//prompt user to choose the display method
+				cout << "Display, " << endl
+					<< "1) Particular Customer record" << endl
+					<< "2) Finished Payment Customer" << endl
+					<< "3) Outstanding Payment Customer" << endl;
+				cout << "Options: ";
+				cin >> input;
+				displayCustomer(file, input);
+				break;
+			//add monthly payment to particular customer
+			case 3:
+				modifyCustomer(file);
+				break;
+			//perform delete a customer record function in the binary file
+			case 4:
+				delCustomer(file);
+				break;
+			//terminate the program 
+			case 0:
+				cout << "Thank you for using, program terminated." << endl;
+				return 0;
+			//request user to re-choose the function, as the user input is invalid
+			default:
+				cout << "Wrong input, please try again." << endl;
+		}
+	}
+}

csci124/asgn2/makefile

@@ -0,0 +1,11 @@
+main:				main.o customerHandler.o
+					g++ -o main main.o customerHandler.o
+
+main.o:				main.cpp customerHandler.h
+					g++ -c main.cpp
+
+customerHandler.o:	customerHandler.cpp customerHandler.h
+					g++ -c customerHandler.cpp
+
+clean:
+					rm *.o