计算适合打印的图纸大小

//现代打印机自带缩放，于是只要计算出宽是高的1.414倍即可
#include <cmath>
#include <cstddef>
#include <fstream>
#include <iostream>

int main(int ,char **) {
    double w,h;

    std::cout<<R"(输入宽：)"<<std::endl;
    std::cin>>w;
    
    std::cout<<R"(输入高：)"<<std::endl;
    std::cin>>h;
    
    std::ofstream ofs(R"(ans.txt)");
    
    w=std::abs(w);
    h=std::abs(h);

    auto c=w/h;

    const auto l=std::sqrt(2.);

    if (c==l) {
        ofs<<w<<","<<h<<std::endl;
    }
    else if (c<l) {
        const auto ans_w=h*l;
        const auto ans_h=h;
        ofs<<"!"<<ans_w<<","<<ans_h<<std::endl;
    }
    else {
        const auto ans_w=w;
        const auto ans_h=w/l;
        ofs<<ans_w<<","<<"!"<<ans_h<<std::endl;
    }

}
//现代打印机自带缩放，于是只要计算出宽是高的1.414倍即可
#include <cm