第13周实践项目1分数类中的运算符重载（4）

/*

*Copyright (c) 2016,烟台大学计算机学院

*All rights reserved.

*文件名称 :

*作 者 : 刘云

*完成日期 : 2016年5月25号

*版 本 号 : v6.0

*

*问题描述 : 定义分数类中<<和>>运算符重载，实现分数的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然。
*输入描述 : 无

*程序输出 :

*/
//(4)
#include<iostream>
using namespace std;
class CFraction
{
private:
int nume; //分子
int deno; //分母
public:
CFraction(int n=1,int d=1):nume(n),deno(d){}
//类与类的加、减、乘、除运算
CFraction operator+(CFraction &c1);
CFraction operator-(CFraction &c1);
CFraction operator*(CFraction &c1);
CFraction operator/(CFraction &c1);
//类与数的加、减、乘、除运算
CFraction operator+(int a);
CFraction operator-(int a);
CFraction operator*(int a);
CFraction operator/(int a);
friend CFraction operator+(int a,CFraction &c1);
friend CFraction operator-(int a,CFraction &c1);
friend CFraction operator*(int a,CFraction &c1);
friend CFraction operator/(int a,CFraction &c1);
//类的比较运算
friend int operator>(CFraction &c1,CFraction &c2);
//类的取正取反运算
CFraction &operator+();
CFraction &operator-();
//定义分数类中和运算符重载，实现分数的输入输出，改造显示方式
friend ostream &operator<<(ostream &output,CFraction &c1);
friend istream &operator>>(istream &input,CFraction &c1);
void qualify();
void show()const;
};

//类与类的加、减、乘、除运算
CFraction CFraction::operator+(CFraction &c1)
{
return CFraction(c1.deno*nume+c1.nume*deno,deno*c1.deno);
}
CFraction CFraction::operator-(CFraction &c1)
{
return CFraction(c1.deno*nume-c1.nume*deno,deno*c1.deno);
}
CFraction CFraction::operator*(CFraction &c1)
{
return CFraction(nume*c1.nume,deno*c1.deno);
}
CFraction CFraction::operator/(CFraction &c1)
{
return CFraction(nume*c1.deno,deno*c1.nume);
}
//类与数的加、减、乘、除运算
CFraction CFraction::operator+(int a)
{
return CFraction(a*deno+nume,deno);
}
CFraction CFraction::operator-(int a)
{
return CFraction(nume-a*deno,deno);
}

CFraction CFraction::operator*(int a)
{
return CFraction(nume*a,deno);
}
CFraction CFraction::operator/(int a)
{
return CFraction(nume,deno*a);
}
//类与数的加、减、乘、除运算,运算符合交换律
CFraction operator+(int a,CFraction &c1)
{
return CFraction(a*c1.deno+c1.nume,c1.deno);
}
CFraction operator-(int a,CFraction &c1)
{
return CFraction(a*c1.deno-c1.nume,c1.deno);
}
CFraction operator*(int a,CFraction &c1)
{
return CFraction(c1.nume*a,c1.deno);
}
CFraction operator/(int a,CFraction &c1)
{
return CFraction(c1.deno*a,c1.nume);
}
//类的取正取反运算
CFraction &CFraction::operator+()
{
nume=nume;
deno=deno;
return *this;
}
CFraction &CFraction::operator-()
{
int n=nume;
nume=deno;
deno=n;
return *this;
}
//定义分数类中和运算符重载，实现分数的输入输出，改造显示方式
ostream &operator<<(ostream &output,CFraction &c1)
{
output<<c1.nume<<'/'<<c1.deno<<endl;
return output;
}
istream &operator>>(istream &input,CFraction &c1)
{
cout<<"请输入分数的分子、分母部分:";
input>>c1.nume>>c1.deno;
return input;
}
int operator>(CFraction &c1,CFraction &c2)
{
if(c1.deno!=c2.deno)
{
if(c1.deno>c2.deno)
return 0;
else
return 1;
}
if(c1.deno==c2.deno)
{
if(c1.nume>c2.nume)
return 1;
else
return 0;
}
}
void CFraction::qualify()
{
int k=1,n=nume,d=deno;
while(deno!=0)
{
k=nume%deno;
nume=deno;
deno=k;
}
n=n/nume;
d=d/nume;
nume=n;
deno=d;
}
void CFraction::show()const
{
if(deno==1)
cout<<nume<<endl;
else
cout<<nume<<'/'<<deno<<endl;
}
int main()
{
CFraction c1(1,2),c2(1,4),c3,a(1,3);
int i=2;
c3=c1+c2;
c3.qualify();
cout<<"(1/2)+(1/4)=";
c3.show();
c3=c1-c2;
c3.qualify();
cout<<"(1/2)-(1/4)=";
c3.show();
c3=c1*c2;
c3.qualify();
cout<<"(1/2)*(1/4)=";
c3.show();
c3=c1/c2;
c3.qualify();
cout<<"(1/2)/(1/4)=";
c3.show();
c3=a+i;
c3.qualify();
cout<<"(1/3)+2=";
c3.show();
c3=i+a;
c3.qualify();
cout<<"2+(1/3)=";
c3.show();
c3=45+a;
c3.qualify();
cout<<"45+(1/3)=";
c3.show();
c3=a*27;
c3.qualify();
cout<<"(1/3)*27=";
c3.show();
c3=5/a;
c3.qualify();
cout<<"5/(1/3)=";
c3.show();
if(c1>c2)cout<<"(1/2)>(1/4)"<<endl;
else cout<<"(1/2)<(1/4)"<<endl;
+c1;
c1.show();
-c1;
c1.show();
cin>>c3;
cout<<c3;
return 0;
}