Why does rand() zlways return 0?

Question

This seems to be a really strange issue:

This is my code:

#import 

int main (int argc, const char * argv[])
{
    @au         


        

Answer 1

It seems unlikely but running some tests, after an srand the first rand seems always to be divisible by 7, at least in an int sized variable.

On several runs I got 1303562743, 2119476443, and 2120232758, all of which mod 7 to 0.

The second rand() works, because it is the second rand(). Throw a rand() before your first rand()... or better yet, use a better random number generator random or arc4rand if available.

Also see Stack Overflow question Why is (rand() % anything) always 0 in C++?.