标签：namespace iostream class 类 c++
要求：
（2）在（1）的基础上，实现分数类中的对象和整型数的四则运算。分数类中的对象可以和整型数进行四则运算，且运算符合交换律。例如：CFraction a(1,3),b; int i=2; 可以完成b=a+i;。同样，可以完成i+a, 45+a, a*27, 5/a等各种运算。
/*
*Copyright (c)2014,烟台大学计算机与控制工程学院
*All rights reserved.
*dood luck
*文件名称：d.cpp
*作 者：张旺华
*完成日期：2015年5月7日
*版 本 号：v1.0
*
*/
#include <iostream>
using namespace std;
class CFraction
{
private:
int nume; // 分子
int deno; // 分母
public:
//构造函数及运算符重载的函数声明
CFraction(int n=0,int d=1):nume(n),deno(d) {};
void setCFraction(int n,int d);
void display();
CFraction operator+(); //取正一目运算
CFraction operator-(); //取反一目运算
friend CFraction change(CFraction &c);
friend CFraction operator+(const CFraction &c1, const CFraction &c2);
friend CFraction operator-(const CFraction &c1, const CFraction &c2);
friend CFraction operator*(const CFraction &c1, const CFraction &c2);
friend CFraction operator/(const CFraction &c1, const CFraction &c2);
friend CFraction operator+(const int &a, const CFraction &c2);
friend CFraction operator-(const int &a, const CFraction &c2);
friend CFraction operator*(const int &a, const CFraction &c2);
friend CFraction operator/(const int &a, const CFraction &c2);
friend CFraction operator+(const CFraction &c1, const int &a);
friend CFraction operator-(const CFraction &c1, const int &a);
friend CFraction operator*(const CFraction &c1, const int &a);
friend CFraction operator/(const CFraction &c1, const int &a);
friend CFraction operator+=( CFraction &c1, const CFraction &c2);
friend CFraction operator-=( CFraction &c1, const CFraction &c2);
friend CFraction operator*=( CFraction &c1, const CFraction &c2);
friend CFraction operator/=( CFraction &c1, const CFraction &c2);
friend bool operator > (CFraction &t,CFraction &c);
friend bool operator < (CFraction &t,CFraction &c);
friend bool operator >= (CFraction &t,CFraction &c);
friend bool operator <= (CFraction &t,CFraction &c);
friend bool operator == (CFraction &t,CFraction &c);
friend bool operator != (CFraction &t,CFraction &c);
//赋值运算符的重载
friend bool operator > (const int &a, const CFraction &c);
friend bool operator < (const int &a, const CFraction &c);
friend bool operator >= (const int &a, const CFraction &c);
friend bool operator <= (const int &a, const CFraction &c);
friend bool operator == (const int &a, const CFraction &c);
friend bool operator != (const int &a, const CFraction &c);
friend bool operator > ( const CFraction &c,const int &a);
friend bool operator < (const CFraction &c,const int &a);
friend bool operator >= (const CFraction &c,const int &a);
friend bool operator <= (const CFraction &c,const int &a);
friend bool operator == (const CFraction &c,const int &a);
friend bool operator != (const CFraction &c,const int &a);
};
int gcd(int a,int b)
{
return a%b==0?b:gcd(b,a%b);
}
void CFraction::setCFraction(int n,int d)
{
nume=n;
deno=d;
}
CFraction change(CFraction &c)
{
int t,a,b;
a=c.nume;
b=c.deno;
t=gcd(a,b);
c.nume/=t;
c.deno/=t;
return c;
}
void CFraction::display()
{
if(nume!=0&&deno!=0)
cout<<nume<<"/"<<deno<<endl;
else if(nume==0&&deno!=0)
cout<<"0"<<endl;
else
cout<<"error"<<endl;
}
CFraction CFraction ::operator+() //取正一目运算
{
return *this;
}
CFraction CFraction ::operator-() //取反一目运算
{
CFraction p(-this->nume,this->deno);
return p;
}
CFraction operator+(const CFraction &c1, const CFraction &c)
{
CFraction p;
p.nume=c1.nume*c.deno+c1.deno*c.nume;
p.deno=c1.deno*c.deno;
return change(p);
}
CFraction operator-(const CFraction &c1, const CFraction &c)
{
CFraction p;
p.nume=c1.nume*c.deno-c1.deno*c.nume;
p.deno=c1.deno*c.deno;
return change(p);
}
CFraction operator*(const CFraction &c1, const CFraction &c)
{
CFraction p;
p.nume=c1.nume*c.nume;
p.deno=c1.deno*c.deno;
return change(p);
}
CFraction operator/(const CFraction &c1, const CFraction &c)
{
CFraction p;
p.nume=c1.nume*c.deno;
p.deno=c1.deno*c.nume;
return change(p);
}
CFraction operator+(const int &a, const CFraction &c2)
{
CFraction p(a,1);
return p+c2;
}
CFraction operator-(const int &a, const CFraction &c2)
{
CFraction p(a,1);
return p-c2;
}
CFraction operator*(const int &a, const CFraction &c2)
{
CFraction p(a,1);
return p*c2;
}
CFraction operator/(const int &a, const CFraction &c2)
{
CFraction p(a,1);
return p/c2;
}
CFraction operator+(const CFraction &c1, const int &a)
{
CFraction p(a,1);
return c1+p;
}
CFraction operator-(const CFraction &c1, const int &a)
{
CFraction p(a,1);
return c1-p;
}
CFraction operator*(const CFraction &c1, const int &a)
{
CFraction p(a,1);
return c1*p;
}
CFraction operator/(const CFraction &c1, const int &a)
{
CFraction p(a,1);
return c1/p;
}
bool operator > (CFraction &t,CFraction &c)
{
return (t.nume*c.deno>t.nume*c.deno);
}
bool operator < (CFraction &t,CFraction &c)
{
return (t.nume*c.deno<t.nume*c.deno);
}
bool operator >= (CFraction &t,CFraction &c)
{
return !(t.nume*c.deno<t.nume*c.deno);
}
bool operator <= (CFraction &t,CFraction &c)
{
return !(t.nume*c.deno>t.nume*c.deno);
}
bool operator == (CFraction &t,CFraction &c)
{
return !(t>c||t<c);
}
bool operator != (CFraction &t,CFraction &c)
{
return (t>c||t<c);
}
bool operator > (const int &a, const CFraction &c)
{
return (a*c.deno)>c.nume;
}
bool operator< (const int &a, const CFraction &c)
{
return (a*c.deno)<c.nume;
}
bool operator >= (const int &a, const CFraction &c)
{
return (a*c.deno)>=c.nume;
}
bool operator <= (const int &a, const CFraction &c)
{
return (a*c.deno)<=c.nume;
}
bool operator == (const int &a, const CFraction &c)
{
return (a*c.deno)==c.nume;
}
bool operator != (const int &a, const CFraction &c)
{
return (a*c.deno)!=c.nume;
}
bool operator > ( const CFraction &c,const int &a)
{
return c.nume>(a*c.deno);
}
bool operator < (const CFraction &c,const int &a)
{
return c.nume<(a*c.deno);
}
bool operator >= (const CFraction &c,const int &a)
{
return c.nume>=(a*c.deno);
}
bool operator <= (const CFraction &c,const int &a)
{
return c.nume<=(a*c.deno);
}
bool operator == (const CFraction &c,const int &a)
{
return c.nume==(a*c.deno);
}
bool operator != (const CFraction &c,const int &a)
{
return c.nume!=(a*c.deno);
}
//赋值运算符的重载
CFraction operator+=( CFraction &c1, const CFraction &c)
{
c1.nume=c1.nume*c.deno+c1.deno*c.nume;
c1.deno=c1.deno*c.deno;
return change(c1);
}
CFraction operator-=( CFraction &c1, const CFraction &c)
{
c1.nume=c1.nume*c.deno-c1.deno*c.nume;
c1.deno=c1.deno*c.deno;
return change(c1);
}
CFraction operator*=( CFraction &c1, const CFraction &c)
{
c1.nume=c1.nume*c.nume;
c1.deno=c1.deno*c.deno;
return change(c1);
}
CFraction operator/=( CFraction &c1, const CFraction &c)
{
c1.nume=c1.nume*c.deno;
c1.deno=c1.deno*c.nume;
return change(c1);
}
int main()
{
CFraction t1(7,9),t2(11,9),t;
cout<<"t1为：";
t1.display();
cout<<"t2为：";
t2.display();
cout<<"下面比较两个数大小：\n";
if (t1>t2) cout<<"t1>t2"<<endl;
if (t1<t2) cout<<"t1<t2"<<endl;
if (t1==t2) cout<<"t1＝t2"<<endl;
if (t1!=t2) cout<<"t1≠t2"<<endl;
if (t1>=t2) cout<<"t1≥t2"<<endl;
if (t1<=t2) cout<<"t1≤t2"<<endl;
t=t1+t2;
t.display();
t=t1-t2;
t.display();
t=t1*t2;
t.display();
t=t1/t2;
t.display();
t1+=t2;
t1.display();
t1-=t2;
t1.display();
t1*=t2;
t1.display();
t1/=t2;
t1.display();
CFraction x(1,3),y(-5,10),s;
cout<<"分数x=1/3 y=-5/10"<<endl;
s=+x+y;
cout<<"+x+y=";
s.display();
s=x-y;
cout<<"x-y=";
s.display();
s=x*y;
cout<<"x*y=";
s.display();
s=x/y;
cout<<"x/y=";
s.display();
s=-x+y;
cout<<"-x+y=";
s.display();
x.display();
if (x>y) cout<<"大于"<<endl;
if (x<y) cout<<"小于"<<endl;
if (x==y) cout<<"等于"<<endl;
y.display();
cout<<endl;
CFraction c1(5,3),c2;
//以下建议在调试环境中完成测试，
c2=c1+5;
c2=5+c1;
c2=c1-5;
c2=5-c1;
c2=c1*5;
c2=5*c1;
c2=c1/5;
c2=5/c1;
bool b;
b=(c1>2);
b=(2>c1);
return 0;
}
一直在尝试着用自己的方法去完成，一下午就为了做这个就这样过去了有点不甘心，但好久没有这样的感觉了，好爽！
标签：namespace iostream class 类 c++
原文地址：http://blog.csdn.net/wh201458501106/article/details/45581515
