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

int main(void)
{
    srand((unsigned) time(NULL));
    
    printf("Obtained 3-digit random number: %4d\n", rand() % 900 + 100);
    printf("Obtained 4-digit random number: %4d\n", rand() % 9000 + 1000);
	
    return 0;
}