Pallav: Added binary search implementation

Java/BinarySearch.java

@@ -0,0 +1,23 @@
+/**
+ * BinarySearch
+ */
+public class BinarySearch {
+
+    public static void main(String[] args) {
+        int[] arr = {2, 3, 4, 5, 6};
+        int target = 4;
+        int start = 0;
+        int end = arr.length - 1;
+        while (start <= end) {
+            int mid = start + (end - start) / 2;
+            if (arr[mid] == target) {
+                System.out.println(mid);
+                break;
+            } else if (arr[mid] > target) {
+                end = mid - 1;
+            } else {
+                start = mid + 1;
+            }
+        }
+    }
+}

Selection Sort

@@ -1,48 +1,39 @@
-#include <bits/stdc++.h> 
-using namespace std; 
-
-void swap(int *xp, int *yp)  
-{  
-    int temp = *xp;  
-    *xp = *yp;  
-    *yp = temp;  
-}  
-
-void selectionSort(int arr[], int n)  
-{  
-    int i, j, min_idx;  
-
-    // One by one move boundary of unsorted subarray  
-    for (i = 0; i < n-1; i++)  
-    {  
-        // Find the minimum element in unsorted array  
-        min_idx = i;  
-        for (j = i+1; j < n; j++)  
-        if (arr[j] < arr[min_idx])  
-            min_idx = j;  
-
-        // Swap the found minimum element with the first element  
-        swap(&arr[min_idx], &arr[i]);  
-    }  
-}  
-
-/* Function to print an array */
-void printArray(int arr[], int size)  
-{  
-    int i;  
-    for (i=0; i < size; i++)  
-        cout << arr[i] << " ";  
-    cout << endl;  
-}  
-
-// Driver program to test above functions  
-int main()  
-{  
-    int arr[] = {64, 25, 12, 22, 11};  
-    int n = sizeof(arr)/sizeof(arr[0]);  
-    selectionSort(arr, n);  
-    cout << "Sorted array: \n";  
-    printArray(arr, n);  
-    return 0;  
-}  
-
+#include<iostream>
+using namespace std;
+void swapping(int &a, int &b) {         //swap the content of a and b
+   int temp;
+   temp = a;
+   a = b;
+   b = temp;
+}
+void display(int *array, int size) {
+   for(int i = 0; i<size; i++)
+      cout << array[i] << " ";
+   cout << endl;
+}
+void selectionSort(int *array, int size) {
+   int i, j, imin;
+   for(i = 0; i<size-1; i++) {
+      imin = i;   //get index of minimum data
+      for(j = i+1; j<size; j++)
+         if(array[j] < array[imin])
+            imin = j;
+         //placing in correct position
+         swap(array[i], array[imin]);
+   }
+}
+int main() {
+   int n;
+   cout << "Enter the number of elements: ";
+   cin >> n;
+   int arr[n];           //create an array with given number of elements
+   cout << "Enter elements:" << endl;
+   for(int i = 0; i<n; i++) {
+      cin >> arr[i];
+   }
+   cout << "Array before Sorting: ";
+   display(arr, n);
+   selectionSort(arr, n);
+   cout << "Array after Sorting: ";
+   display(arr, n);
+}