/* "random" is declared in stdlib.h. */
#include <stdlib.h>
/* This program uses "time" to seed the random number generator. */
#include <time.h>
#include <stdio.h>

int main ()
{
    int i;
    /* This prints the same random numbers each time. */
    for (i = 0; i < 5; i++) {
        printf ("%d:%ld\n", i, random ());
    }
    /* To get different random numbers, use "srandom" to seed the
       random number generator with the current time in seconds. */
    srandom (time (0));
    /* This prints different random numbers each time. */
    for (i = 0; i < 5; i++) {
        printf ("%d:%ld\n", i, random ());
    }
    return 0;
}