rand() / srand()

/* srand example */

#include <stdio.h>      /* printf, NULL */

#include <stdlib.h>     /* srand, rand */

#include <time.h>       /* time */

int main()

{

printf("First number: %d\n", rand() % 1000);

printf("Second number: %d\n", rand() % 1000);

srand(time(NULL));

printf("Random first number: %d\n", rand() % 1000);

printf("Random second number: %d\n", rand() % 1000);

srand(1);

printf("Again the first number: %d\n", rand() % 1000);

printf("Again the second number: %d\n", rand() % 1000);

return 0;

}

maybe srand를 호출하지 않으면, srand(1)과 같다...