第九周实验报告任务三

/* (程序头部注释开始)
* 程序的版权和版本声明部分

* Copyright (c) 2011, 烟台大学计算机学院学生

* All rights reserved.* 文件名称：分数
* 作者：郭岩岩

* 完成日期：2012年4月10日

* 版本号：vc.1

* 对任务及求解方法的描述部分

* 输入描述：

* 问题描述：

* 程序输出：

*程序头部的注释结束

*/

#include<iostream>
using namespace std;
int gcd(int,int);
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 Simplify();            //化简（使分子分母没有公因子）
CFraction operator+(CFraction &c);
CFraction operator-(CFraction &c);
CFraction operator*(CFraction &c);
CFraction operator/(CFraction &c);
CFraction operator-();
bool operator>(CFraction &c);
bool operator<(CFraction &c);
bool operator==(CFraction &c);
bool operator!=(CFraction &c);
bool operator>=(CFraction &c);
bool operator<=(CFraction &c);
friend istream& operator >> (istream& input,CFraction &c);
friend ostream& operator << (ostream& output,CFraction &c);

};
istream& operator >> (istream& input,CFraction &c)
{
char a;
cout<<"请输入一个分数，例如：3/4:"<<endl;
input>>c.nume ;
input>>a;
input>>c.deno;
while(a!='/')
{
cout<<"输入格式不对，请重新输入！";
}

while(c.deno ==0)
{
cout<<"分数的分母不能为零，请重新输入！";
}
return input;

}
ostream& operator << (ostream& output,CFraction &c)
{
output<<c.nume <<"/"<<c.deno ;
return output;
}

CFraction::CFraction(int nu,int de)
{
if(de!=0)
{
nume=nu;
deno=de;
}
else
{
cerr<<"初始化中发生错误，程序退出\n";
exit(0);
}
}
void CFraction::Set(int nu,int de)
{
if(deno!=0)
{
nume=nu;
deno=de;
}
}

//化简
void CFraction::Simplify()
{
int n=gcd(nume,deno);
nume=nume/n;
deno=deno/n;
}
int gcd(int m,int n)
{
int r;
if (m<n){r=m;m=n;n=r;}
while(r=m%n)  // 求m，n的最大公约数（原来求公约数可以这样求啊）
{
m=n;
n=r;
}
return n;
}
CFraction CFraction::operator+(CFraction &c)
{
CFraction c2;
c2.nume =nume*c.deno +c.nume*deno ;
c2.deno =deno*c.deno ;
c2.Simplify();
return c2;
}
CFraction CFraction::operator-(CFraction &c)
{
CFraction c2;
c2.nume =nume*c.deno -c.nume*deno ;
c2.deno =deno*c.deno ;
c2.Simplify ();
return c2;
}
CFraction CFraction::operator*(CFraction &c)
{
CFraction c2;
c2.nume =nume*c.nume;
c2.deno =deno*c.deno ;
c2.Simplify();
return c2;
}
CFraction CFraction::operator/(CFraction &c)
{
CFraction c2;
c2.nume =nume*c.deno ;
c2.deno =deno*c.nume  ;
c2.Simplify();
return c2;
}
CFraction CFraction::operator-()
{
CFraction c2;
c2.nume =0-nume;
c2.deno =deno ;
c2.Simplify();
return c2;
}
bool CFraction::operator>(CFraction &c)
{
if((nume*c.deno -c.nume*deno)>0)
{
return true;
}
else
return false;
}
bool CFraction::operator<(CFraction &c)
{
CFraction c2;
if((nume*c.deno -c.nume*deno)<0)
{
return true;
}
else
return false;
}
bool CFraction::operator==(CFraction &c)
{
CFraction c2;
if((nume*c.deno -c.nume*deno)==0)
{
return true;
}
else
return false;
}
bool CFraction::operator!=(CFraction &c)
{
CFraction c2;
if((nume*c.deno -c.nume*deno)!=0)
{
return true;
}
else
return false;
}
bool CFraction::operator>=(CFraction &c)
{
CFraction c2;
if((nume*c.deno -c.nume*deno)>=0)
{
return true;
}
else
return false;
}
bool CFraction::operator<=(CFraction &c)
{
CFraction c2;
if((nume*c.deno -c.nume*deno)<=0)
{
return true;
}
else
return false;
}

int main()
{
CFraction cf1,cf2,cf3;
cin>>cf1;
//cout<<cf1;
cin>>cf2;
//cout<<cf2;
cf3=cf1+cf2;
cout<<"cf3+cf2=";
cout<<cf3<<endl;
cf3=cf1-cf2;
cout<<"cf3-cf2=";
cout<<cf3<<endl;
cf3=cf1*cf2;
cout<<"cf3*cf2=";
//cout<<cf3<<endl;
cf3=cf1/cf2;
cout<<cf3<<endl;
cf3=-cf1;
cout<<"cf3/cf2=";
cout<<cf3<<endl;
if(cf1>cf2)
{
cout<<"cf1>cf2"<<endl;
}

if(cf1>cf2)
{
cout<<"cf1>cf2"<<endl;
}
if(cf1<cf2)
{
cout<<"cf1<cf2"<<endl;
}
if(cf1==cf2)
{
cout<<"cf1==cf2"<<endl;
}
if(cf1!=cf2)
{
cout<<"cf1!=cf2"<<endl;
}
if(cf1>=cf2)
{
cout<<"cf1>=cf2"<<endl;
}
if(cf1<=cf2)
{
cout<<"cf1<=cf2"<<endl;
}

system("pause");
return 0;

}