Insertion sort in C programming

#include<stdio.h>
int main()
{
    int arr[100],n,key,i,j,k;
    printf("Enter the elements in array\n");
    scanf("%d",&n);
    printf("Enter %d number\n",n);
    for(i=0;i<n;i++)
    {
        scanf("%d",&arr[i]);
    }
    for(i=0;i<n;i++){
        key=arr[i];
        j=i-1;
        while(j>=0 && arr[j]>key)
        {
            arr[j+1]=arr[j];
            j=j-1;
        }
        arr[j+1]=key;
    }
    for(i=0;i<n;i++)
        printf("%d\n",arr[i]);
    return 0;

}