这题的目的是什么？

#include <iostream>

using namespace std;

int main()
{
    double num;
    while((std::cin >> num), (num != 0.00)) {
        double mo = 2.00, tmp = 0.00;
        int c = 0u;
        while(tmp < num) {
            tmp += 1.00 / mo;
            mo += 1.00;
            ++c;
        }

        std::cout << c << " card(s)" << std::endl;
    }

    return 0;
}