c++ - rand() returns same values when called within a single function

Question

I'm a C++ newbie and I'm stumped on this. I need to call this function in my main function three times but each time it gives me the same result, i.e. pull_1, pull_2, pull_3 are the same. What do I need to do to make them actually random?

string PullOne()
{
    string pick;
    string choices[3] = {"BAR", "7", "cherries"};

    std::srand(time(0));
    pick = choices[(std::rand() % 3)];
    return pick;
}

From my main function:

string pull_1, pull_2, pull_3;
pull_1 = PullOne();
pull_2 = PullOne();
pull_3 = PullOne();

Answer 1

You shouldn't call srand() before each call to rand(). Call it once – somewhere at the start of your program.

The problem is you restart the random generator so it starts to produce the very same pseudorandom sequence from the very same point.