C Tutorial/stdlib.h/srand
srand
Item Value Header file stdlib.h Declaration void srand(unsigned int seed); Function sets a starting point for the sequence generated by rand(). Return returns pseudorandom numbers.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(void)
{
int i, stime;
long ltime;
/* get the current calendar time */
ltime = time(NULL);
stime = (unsigned) ltime/2;
srand(stime);
for(i=0; i<10; i++) printf("%d ", rand());
return 0;
}