Added Insertion sort in c++

Author: Akshita1997

Sorting/Insertion_Sort.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+#include <math.h>
+using namespace std;
+ 
+/* Function to sort an array using insertion sort*/
+void insertionSort(int arr[], int n)
+{
+   int i, key, j;
+   for (i = 1; i < n; i++)
+   {
+       key = arr[i];
+       j = i-1;
+ 
+       /* Move elements of arr[0..i-1], that are
+          greater than key, to one position ahead
+          of their current position */
+       while (j >= 0 && arr[j] > key)
+       {
+           arr[j+1] = arr[j];
+           j = j-1;
+       }
+       arr[j+1] = key;
+   }
+}
+ 
+// A utility function ot print an array of size n
+void printArray(int arr[], int n)
+{
+   int i;
+   for (i=0; i < n; i++)
+       cout<<arr[i]<<endl;
+   
+}
+ 
+ 
+ 
+/* Driver program to test insertion sort */
+int main()
+{
+    int arr[] = {12, 11, 13, 5, 6};
+    int n = sizeof(arr)/sizeof(arr[0]);
+ 
+    insertionSort(arr, n);
+    printArray(arr, n);
+ 
+    return 0;
+}