Deletion of zeros

#include "StdAfx.h"
#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>


int main()
{
int *a;
int i, n, j = 0;

printf("Enter the size : ");
scanf_s("%d",&n);

a = (int*) malloc (n * sizeof(int));

for (i = 0; i < n; i++)
{
printf("a[%d] = ", i);
scanf_s("%d", &a[i]);
}

for (i = 0; i < n; i++)
{
if (a[i] != 0) {
a[j] = a[i];
j++;
}
}

a = (int*) realloc(a, j * sizeof(int));

for (i = 0; i < j; i++) {
printf("a[%d] = %d\n", i, a[i]);
}

return 0;
}