insertion_sort.c

// 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]; 
       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 to 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, 13, 5, 6}; 
    int n = sizeof(arr)/sizeof(arr[0]); 
  
    insertionSort(arr, n); 
    printArray(arr, n); 
  
    return 0; 
} 

// Credits - https://www.geeksforgeeks.org/insertion-sort/