#include <iostream>

int main()
{
    double tmp = 1.;
    double eps;
    while(tmp != 0) {
        eps = tmp;
        tmp /= 2.;
    }
    if(eps == 0) {
        std::cout << "(1)eps is zero!\n";
    }
    std::cout << "eps before: " << eps;
    if(eps == 0) {
        std::cout << "(2)eps is zero!\n";
    }

    while(eps < 1.) {
        tmp = eps;
        eps *= 2.;
        if(tmp == eps) {
            printf("wtf?\n");
        }
    }
    
    std::cout << "eps after: " << eps;
}