InsertionSort.cpp

// C program for insertion sort
#include <stdio.h>
#include <math.h>
 
/* 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]; //making the initial element the key and using this for comparison
       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) //comparing all with the smallest. 
       {
           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++)
       printf("%d ", arr[i]);
   printf("\n");
}
 
 
 
/* Driver program to test insertion sort */
int main()
{
    int arr[] = {12, 11, 10, 9, 8};
    int n = sizeof(arr)/sizeof(arr[0]);
 
    insertionSort(arr, n);
    printArray(arr, n);
 
    return 0;
}