分数加减乘除 c++

此文件仅供参考，有不完善的地方请告诉我，我将进行完善，谢谢合作！！
本程序是实现分数的加减乘除的，对+ - * / 进行了重载

 

//类的头文件class fraction{private: int nr; //分子 int dn; //分母public: fraction input(); fraction operator +(fraction &); fraction operator -(fraction &); fraction operator *(fraction &); fraction operator /(fraction &); void output(); //输出约分后的分数 void output1(); // 输出普通分数};//成员函数#include<iostream.h>#include"fclass.h"fraction fraction::operator+(fraction &a){ fraction g; g.dn=dn*a.dn; g.nr=nr*a.dn+a.nr*dn; return g;}fraction fraction::operator-(fraction &a){ fraction g; g.dn=dn*a.dn; g.nr=nr*a.dn-a.nr*dn; return g;}fraction fraction::operator*(fraction &a){ fraction g; g.dn=dn*a.dn; g.nr=nr*a.nr; return g;}fraction fraction::operator/(fraction &a){ fraction g; g.dn=dn*a.nr; g.nr=nr*a.dn; return g;}fraction fraction::input(){ fraction a; cin>>a.nr>>a.dn; return a;}void fraction::output(){ int i; if(dn==0) cout<<"error"<<endl; else if(nr%dn==0) cout<<nr/dn<<endl; else { for(i=2;i<=nr||i<=dn;) { if(nr%i==0&&dn%i==0) { nr=nr/i; dn=dn/i; i=2; } else i++; } cout<<nr <<"/"<<dn<<endl; }}void fraction::output1(){ cout<<nr<<"/"<<dn;}//主函数#include<iostream.h>#include"fclass.h"void menu(){ cout<<"=================================================="<<endl; cout<<"1-输入2个新的分数，可进行如下运算:"<<endl; cout<<"2-加法"<<endl; cout<<"3-减法"<<endl; cout<<"4-乘法"<<endl; cout<<"5-除法"<<endl; cout<<"6-退出"<<endl; cout<<"=================================================="<<endl;}void main(){ void menu(); int m; bool flag=true; fraction s1,s2,s3; while(flag) { menu(); cin>>m; switch(m) { case 1: cout<<"请按照如下方式输入2个分数: 分子/分母"<<endl; s1=s1.input(); s2=s2.input(); cout<<"请输入你要进行的计算:"<<endl; break; case 2: s3=s1+s2; s1.output1(); cout<<" + "; s2.output1(); cout<<"="; s3.output(); break; case 3: s3=s1-s2; s1.output1(); cout<<" - "; s2.output1(); cout<<"="; s3.output(); break; case 4: s3=s1*s2; s1.output1(); cout<<" * "; s2.output1(); cout<<"="; s3.output(); break; case 5: s3=s1/s2; s1.output1(); cout<<" / "; s2.output1(); cout<<"="; s3.output(); break; case 6: flag=false; break; default: break; } } }