Shaving: When and Whether to.

//  shavewhen.cpp

#include <cstdlib>
#include <iostream>
#include <random>

int main()
{
    std::random_device rd;
    std::mt19937 mt {rd()};
    std::bernoulli_distribution when {1.0f / 30.0f};
    std::bernoulli_distribution whether_to {1.0f / 75.0f};

    bool shave {true};
    int day_count {0};
    while (!when(mt))
    {
        if (whether_to(mt)) shave = false;
        ++day_count;
    }
    std::cout << "Number of days: " << day_count << "\n" << std::endl;
    if (!shave)
    {
        std::cout << "Wait, you know what? don't even shave.\n" << std::endl;
    }

    return EXIT_SUCCESS;
}