Why is rand() not so random after fork?

Question

#include 
#include 
#include 
#include 

int main() {
    int i =10;
    /* initialize random seed:  */
         


        

Answer 1

This solve the problem:

srand48((long int)time(NULL));
i= (lrand48()/rand()+1) % 123

I havent tested with fork, but inside a for calling 100 times it works.

seed with the pid number. It's a little but difficult to solve problem.

This was in some page: "this worked srand(time(0)+getpid()); but I had to call this within the case 0 i.e child process".