第8周项目3-分数类中的运算符重载-优快云博客

本文链接：https://blog.youkuaiyun.com/sinat_21382429/article/details/45795857

本文介绍了一个名为CFraction的类，用于实现分数的各种数学运算，包括加减乘除及大小比较，并通过一个简单的示例展示了如何使用这个类来操作分数。

#include <iostream>

#include <cstdlib>

using namespace std;

class CFraction
{
private:
    int nume;
    int deno;
public:
    CFraction(int nu=0,int de=1);
    void set(int nu,int de);
    void input();
    void simplify();
    void output();
    int gcd(int a,int b);
    CFraction operator+(CFraction &c);
    CFraction operator-(CFraction &c);
    CFraction operator*(CFraction &c);
    CFraction operator/(CFraction &c);
    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)
{
    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::input()
{
    int nu,de;
    char c;
    cout<<"请输入分数：";
    while(1)
    {
        cin>>nu>>c>>de;
        if(c!='/')
        {
            cout<<"格式错误!"<<endl;
            continue;
        }
        else if(de==0)
        {
            cout<<"格式错误！"<<endl;
            continue;
        }
        else
            break;
    }
    nume=nu;
    deno=de;
}

int CFraction::gcd(int a,int b)
{
    int r;
    while(a!=0)
    {
        r=a%b;
        a=r;
        b=r;
    }
    return a;
}

void CFraction::set(int nu,int de)
{
    if(de!=0)
    {
        nume=nu;
        deno=de;
    }
}

void CFraction::simplify()
{
    int a;
    a=gcd(nume,deno);
    nume/=a;
    deno/=a;
}

void CFraction::output()
{
    cout<<nume<<"/"<<deno<<endl;
}

CFraction CFraction::operator+(CFraction &c)
{
    CFraction t;
    t.nume=nume*c.deno+c.nume*deno;
    t.deno=deno*c.deno;
    t.simplify();
    return t;
}

CFraction CFraction::operator-(CFraction &c)
{
    CFraction t;
    t.nume=nume*c.deno-c.nume*deno;
    t.deno=deno*c.deno;
    t.simplify();
    return t;
}

CFraction CFraction::operator*(CFraction &c)
{
    CFraction t;
    t.deno=deno*c.deno;
    t.nume=nume*c.nume;
    t.simplify();
    return t;
}

CFraction CFraction::operator/(CFraction &c)
{
    if (!c.nume) {
        cout<<"运算错误！\n";
        return *this;
        }

    CFraction t;
    t.deno=deno*c.nume;
    t.nume=nume*c.deno;
    t.simplify();
    return t;
}

bool CFraction::operator>(CFraction &c)
{
    CFraction t;
    t=*this-c;
    if(t.nume*t.deno>0)
        return true;
    else
        return false;
}

bool CFraction::operator<(CFraction &c)
{
    CFraction t;
    t=*this-c;
    if(t.nume*t.deno<0)
        return true;
    else
        return false;
}

bool CFraction::operator>=(CFraction &c)
{
    if(*this<c)
        return false;
    else
        return false;
}

bool CFraction::operator<=(CFraction &c)
{
    if(*this>c)
        return false;
    else
        return true;
}

bool CFraction::operator==(CFraction &c)
{
    CFraction t;
    t=*this-c;
    if(t.nume*t.deno==0)
        return true;
    else
        return false;
}

bool CFraction::operator!=(CFraction &c)
{
    if(*this==c)
        return false;
    else
        return true;
}

int main()
{
    CFraction x(1,2),y(1,3),t;
    cout<<"两个分数分别为 x=1/2,y=1/3"<<endl;
    t=x-y;
    cout<<"x-y=";
    t.output();
    t=x+y;
    cout<<"x+y=";
    t.output();
    t=x*y;
    cout<<"x*y=";
    t.output();
    t=x/y;
    cout<<"x/y=";
    t.output();
    x.output();
    if(x>y) cout<<"大于"<<endl;
    if(x<y) cout<<"小于"<<endl;
    if(x>=y) cout<<"大于等于"<<endl;
    if(x<=y) cout<<"小于等于"<<endl;
    if(x==y) cout<<"等于"<<endl;
    if(x!=y) cout<<"不等于"<<endl;
    y.output();
    return 0;
}

运行到一半就停止运行，找不出原因= =。