C program to sort an array using insertion sort

#include <stdio.h>
#define N 100
void sort(int [],int);
main()
{
int i,n;
int a[n];
printf("Enter the size of the array\n");
scanf("%d",&n);
printf("Enter the munbers...\n");
for(i=0;i<n;i++)
scanf("%d",&a[i]);
sort(a,n);
printf("Sorted array is....\n");
for(i=0;i<n;i++)
printf("%2d\n",a[i]);
}
void sort(int a[],int n)
{
int i,j,k;
for(i=0;i<n;i++)
{
j=i-1;
k=a[i];
while(j>=0 && a[j]>k)
{
a[j+1]=a[j];
j=j-1;
}
a[j+1]=k;
}

}