#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;
}
 

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