第八周任务三：实现分数类中的运算符重载

#include<iostream>using namespace std;class CFraction{private:int nume;  // 分子int deno;  // 分母public:CFraction(int nu=0,int de=1);   //构造函数，初始化用void Set(int nu=0,int de=1);    //置值，改变值时用void input();               //按照"nu/de"的格式，如"5/2"的形式输入void Simplify();            //化简（使分子分母没有公因子）void output(int );      //输出：以8/6为例，style为0时，输出8/6；//style为1时，输出4/3；//style为2时，输出1(1/3)，表示一又三分之一；//不给出参数和非1、2，认为是方式0CFraction operator+(CFraction &c);//实现分数的加法并化简CFraction operator-(CFraction &c);//实现分数的减法并化简CFraction operator*(CFraction &c);//实现分数的乘法并化简CFraction operator/(CFraction &c);//实现分数的除法并化简CFraction operator--();//实现分数的求反//比较运算符(二目)的重载bool operator>(CFraction &c);bool operator<(CFraction &c);bool operator>=(CFraction &c);bool operator<=(CFraction &c);bool operator==(CFraction &c);bool operator!=(CFraction &c);};CFraction::CFraction (int nu, int de)//定义构造函数{nume=nu;deno=de;}void CFraction::Set(int nu,int de){nume=nu;deno=de;}void CFraction::input(){char c1;cout<<"请输入一个数：（格式nume/deno）";while(1){cin>>nume>>c1>>deno;if(c1!='/')cout<<"格式不正确，请重新输入"<<endl;if (deno==0){cout<<"分数错误,请退出！";}elsebreak;}}void CFraction::Simplify(){int i;if(nume>deno)//分分子和分母哪个大小两种情况{for(i=2;i<=nume;i++){if(nume%i==0&&deno%i==0){nume=nume/i;deno=deno/i;i=2;}}}elsefor(i=2;i<=deno;i++){if(nume%i==0&&deno%i==0){nume=nume/i;deno=deno/i;i=2;}}}void CFraction::output(int style){if(style==1){Simplify();cout<<nume<<"/"<<deno;}if( style==2){int n;if(nume>=deno){n=nume/deno;nume=nume-n*deno;cout<<n<<"("<<nume<<"/"<<deno<<")";}}elsecout<<nume<<"/"<<deno;}CFraction CFraction::operator+(CFraction &c)//实现分数的加法并化简{CFraction c1;c1.deno=deno*c.deno;c1.nume=nume*c.deno+c.nume*deno;Simplify();return c1;}CFraction CFraction::operator-(CFraction &c)//实现分数的减法并化简{CFraction c1;c1.deno=deno*c.deno;c1.nume=nume*c.deno-c.nume*deno;Simplify();return c1;}CFraction CFraction::operator*(CFraction &c)//实现分数的乘法并化简{CFraction c1;c1.deno=deno*c.deno;c1.nume=nume*c.nume;Simplify();return c1;}CFraction CFraction::operator/(CFraction &c)//实现分数的除法并化简{CFraction c1;c.deno=c.nume;c.nume=c.deno;c1.deno=deno*c.deno;c1.nume=nume*c.nume;Simplify();return c1;}CFraction CFraction::operator--()//实现分数的求反{CFraction c1;c1.deno=0-deno;c1.nume=0-nume;Simplify();return c1;}//比较运算符(二目)的重载bool CFraction::operator>(CFraction &c){nume=nume*c.deno;deno=deno*c.deno;c.nume=c.nume*deno;c.deno=c.deno*deno;if(nume>c.nume){return true;}else{return false;}}bool CFraction::operator<(CFraction &c){nume=nume*c.deno;deno=deno*c.deno;c.nume=c.nume*deno;c.deno=c.deno*deno;if(nume<c.nume){return true;}else{return false;}}bool CFraction::operator>=(CFraction &c){if(*this<c){return false;}else{return true;}}bool CFraction::operator<=(CFraction &c){if(*this>c){return false;}else{return true;}}bool CFraction::operator==(CFraction &c){nume=nume*c.deno;deno=deno*c.deno;c.nume=c.nume*deno;c.deno=c.deno*deno;if(nume==c.nume){return true;}else{return false;}}bool CFraction::operator!=(CFraction &c){nume=nume*c.deno;deno=deno*c.deno;c.nume=c.nume*deno;c.deno=c.deno*deno;if(nume!=c.nume){return true;}else{return false;}}void main(){CFraction c1(3,5),c2(1,2),c;c=c1+c2;cout<<"c1+c2=";c.output(0);cout<<endl;c=c1-c2;cout<<"c1-c2=";c.output(0);cout<<endl;c=c1*c2;cout<<"c1*c2=";c.output(0);cout<<endl;c=c1/c2;cout<<"c1/c2=";c.output(0);cout<<endl;c=--c1;cout<<"--c1=";c.output(0);cout<<endl;cout<<"下面比较两个分数的大小：\n";if (c1>c2) cout<<"c1>c2"<<endl;if (c1<c2) cout<<"c1<c2"<<endl;if (c1==c2) cout<<"c1＝c2"<<endl;if (c1!=c2) cout<<"c1≠c2"<<endl;if (c1>=c2) cout<<"c1≥c2"<<endl;if (c1<=c2) cout<<"c1≤c2"<<endl;cout<<endl;system("pause");}

运行结果：