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

int main(void)
{
    srand((unsigned) time(NULL));
    
    int num = rand() % 900 + 100;
    printf("1st random number: %d\n", num);
	
    num = rand() % (999 - num) + num + 1;
    printf("2nd random number: %d\n", num);
	
    num = rand() % (999 - num) + num + 1;
    printf("3rd random number: %d\n", num);
	
    return 0;
}