How to generate 12 digit random number in C?

I'm trying to generate 12 digit random numbers in C, but it's always generating 10 digit numbers.

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

void main()
{
   srand(time(NULL));
   long r = rand();
   r = r*100;
   printf("%ld",r);
}