Seeding a random number generator C++ [duplicate]

Answer 1

You should see random once at the begining of you program:

int main()
{
    // When testing you probably want your code to be deterministic
    // Thus don't see random and you will get the same set of results each time
    // This will allow you to use unit tests on code that use rand().
    #if !defined(TESTING)
    srand(time(NULL));  // Never call again
    #endif

    // Your code here.

}