cPP-ex.rar_ex

#include <iostream> using namespace std; class Fraction { private: int x; int y; public: Fraction(int x=0,int y=1):x(x),y(y) { } friend ostream& operator<<(ostream& oss,const Fraction& f); friend istream& operator>>(istream& iss,Fraction& f); Fraction operator*(const Fraction& f); bool operator==(const Fraction& f); bool operator<(const Fraction& f); }; ostream& operator<<(ostream& oss,const Fraction& f) { return oss<<f.x<<"/"<<f.y; } istream& operator>>(istream& iss,Fraction& f) { return iss>>f.x>>f.y; } Fraction Fraction::operator*(const Fraction& f) { Fraction ff; ff.y=this->y*f.y; ff.x=this->x*f.x; return ff; //return Fraction(this->x*f.y+this->y*f.x,this->y*f.y); } bool Fraction::operator==(const Fraction& f) { return this->x==f.x&&this->y==f.y; } bool Fraction::operator<(const Fraction& f) { return this->x*f.y<this->y*f.x; } int main() { Fraction f; cout<<"please input Fraction x&y:"<<endl; cin>>f; cout<<f<<endl; Fraction ff; cout<<"please input Fraction x&y again:"<<endl; cin>>ff; cout<<ff<<endl; cout<<"f<ff: "; cout<<(f<ff)<<endl; cout<<"f==ff: "; cout<<(f==ff)<<endl; }