a program a day 20(ds,straight insertion sort)

/**
*Straight Insertion Sort
**/
#define keyType int
#include<stdio.h>
int insertSort(keyType array[],int n)
{
 keyType tmp;
 for(int i = 1;i < n;i++)
 {
  tmp = array[i];
  int j = i -1;
  while(j >= 0 && array[j] > tmp)//if ' array < tmp ',descend
   array[j+1] = array[j--];
  array[j+1] = tmp;
 }
 return 0;
}
int main()
{
 keyType arr[10] = {6,4,72,10,4,51,23,100,47,0};
 printf("the array before sorted is :\n");
 for(int i = 0;i < 10;i++)
  printf("%d ",arr[i]);
 insertSort(arr,10);
 printf("\nthe result of insertion sorting is :\n");
 for(int j = 0;j < 10;j++)
  printf("%d ",arr[j]);
 printf("\n");
 return 0;
}