#include #include namespace Distance{ class MyDistance{ public: MyDistance(double i):m(i){} friend MyDistance operator +(const MyDistance& a, const MyDistance& b){ return MyDistance(a.m + b.m); } friend MyDistance operator -(const MyDistance& a, const MyDistance& b){ return MyDistance(a.m - b.m); } friend MyDistance operator *(double m, const MyDistance& a){ return MyDistance(m*a.m); } friend std::ostream& operator<< (std::ostream &out, const MyDistance& myDist){ out << myDist.m << " m"; return out; } private: double m; }; namespace Unit{ MyDistance operator "" _km(long double d){ return MyDistance(1000*d); } MyDistance operator "" _m(long double m){ return MyDistance(m); } MyDistance operator "" _dm(long double d){ return MyDistance(d/10); } MyDistance operator "" _cm(long double c){ return MyDistance(c/100); } MyDistance operator "" _ft(long double d){ return MyDistance(0.348*d); } MyDistance operator "" _mi(long double d){ return MyDistance(1609.344 *d); } } } using namespace Distance::Unit; int main(){ std:: cout << std::endl; std::cout << "1.0_km: " << 1.0_km << std::endl; std::cout << "1.0_m: " << 1.0_m << std::endl; std::cout << "1.0_dm: " << 1.0_dm << std::endl; std::cout << "1.0_cm: " << 1.0_cm << std::endl; std::cout << "1.0_ft: " << 1.0_ft << std::endl; std::cout << "1.0_mi: " << 1.0_mi << std::endl; std::cout << std::endl; std::cout << "0.001 * 1.0_km: " << 0.001 * 1.0_km << std::endl; std::cout << "10 * 1_dm: " << 10 * 1.0_dm << std::endl; std::cout << "100 * 1.0cm: " << 100 * 1.0_cm << std::endl; std::cout << std::endl; std::cout << "1.0_km + 2.0_dm + 3.0_dm + 4.0_cm: " << 1.0_km + 2.0_dm + 3.0_dm + 4.0_cm << std::endl; std::cout << std::endl; Distance::MyDistance work = 63.0_km; Distance::MyDistance workPerDay = 2 * work; Distance::MyDistance abbreviationToWork = 5400.0_m; Distance::MyDistance workout = 2 * 1600.0_m; Distance::MyDistance shopping = 2 * 1200.0_m; Distance::MyDistance myDistancePerWeek = 4 * workPerDay - 3 * abbreviationToWork + workout + shopping; std::cout << "4 * workPerDay - 3 * abbreviationToWork + workout + shopping: " << myDistancePerWeek; std::cout << "\n\n"; }

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