C++类的运算符重载

news2025/10/31 17:13:46

目标

让自定义的类直接使用运算符运算

代码

头文件及类定义

#include <iostream>

using namespace std;
class Complex
{
    int rel;
    int vir;
public:
    void show()
    {
        cout <<"("<<this->rel<<","<<this->vir<<"i"<<")"<<endl;
    }
    Complex(int rel,int vir):rel(rel),vir(vir){}
    Complex(){}
    Complex operator+(const Complex other);
    Complex operator-(const Complex other);
    Complex operator/(const Complex other);
    Complex operator*(const Complex other);
    Complex operator%(const Complex other);
    bool operator==(const Complex other);
    bool operator>(const Complex other);
    bool operator<(const Complex other);
    bool operator&&(const Complex other);
    bool operator||(const Complex other);
    bool operator!();
    Complex operator++();
    Complex operator--();
    friend Complex operator++(Complex &c1,int);
    friend Complex operator--(Complex &c1,int);

};

自增自减运算符

//后自增
Complex operator++(Complex &c1,int)
{
    Complex temp;
    temp.rel=(c1.rel)++;
    temp.vir=(c1.vir)++;
    cout <<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//后自减
Complex operator--(Complex &c1,int)
{
    Complex temp;
    temp.rel=c1.rel--;
    temp.vir=(c1.vir)--;
    cout <<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//前自增
Complex Complex::operator++()
{
    Complex temp;
    temp.rel=++(this->rel);
    temp.vir=++(this->vir);
    cout <<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//前自减
Complex Complex::operator--()
{
    Complex temp;
    temp.rel=--(this->rel);
    temp.vir=--(this->vir);
    cout <<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}

逻辑判断运算符

//等于判断
bool Complex::operator==(const Complex other)
{

    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"=="<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout<<boolalpha<<((this->rel==other.rel)&&(this->vir==other.vir))<<endl;
    return (this->rel==other.rel)&&(this->vir==other.vir);
}
//大于判断
bool Complex::operator>(const Complex other)
{
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<">"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout<<boolalpha<<((this->rel>other.rel)&&(this->vir>other.vir))<<endl;
    return (this->rel>other.rel)&&(this->vir>other.vir);
}

//小于判断
bool Complex::operator<(const Complex other)
{
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"<"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout<<boolalpha<<((this->rel<other.rel)&&(this->vir<other.vir))<<endl;
    return (this->rel<other.rel)&&(this->vir<other.vir);
}

逻辑与或非

//逻辑与
bool Complex::operator&&(const Complex other)
{
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"&&"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout<<boolalpha<<((this->rel||this->vir)&&(other.rel||other.vir))<<endl;
    return (this->rel||this->vir)&&(other.rel||other.vir);
}
//逻辑或
bool Complex::operator||(const Complex other)
{
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"||"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout<<boolalpha<<((this->rel||this->vir)||(other.rel||other.vir))<<endl;
    return (this->rel||this->vir)||(other.rel||other.vir);
}
//逻辑非
bool Complex::operator!()
{
    cout <<"!"<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<":";
    cout<<noboolalpha<<(!(this->rel||this->vir))<<endl;
    return !(this->rel||this->vir);
}

算术运算符

//成员函数版本的加法运算符重载
Complex Complex::operator+(const Complex other)
{
    Complex temp;
    temp.rel =  this->rel+other.rel;
    temp.vir = this->vir+other.vir;
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"+"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout <<"="<<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//成员函数版本的减法运算符重载
Complex Complex::operator-(const Complex other)
{
    Complex temp;
    temp.rel = this->rel-other.rel;
    temp.vir = this->vir-other.vir;
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"-"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout <<"="<<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//成员函数版本的除法运算符重载
Complex Complex::operator/(const Complex other)
{
    Complex temp;
    temp.rel = this->rel/other.rel;
    temp.vir = this->vir/other.vir;
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"/"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout <<"="<<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//成员函数版本的乘法运算符重载
Complex Complex::operator*(const Complex other)
{
    Complex temp;
    temp.rel = this->rel*other.rel;
    temp.vir = this->vir*other.vir;
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"*"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout <<"="<<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}
//成员函数版本的除余运算符重载
Complex Complex::operator%(const Complex other)
{
    Complex temp;
    temp.rel = this->rel%other.rel;
    temp.vir = this->vir%other.vir;
    cout<<"("<<this->rel<<","<<this->vir<<"i"<<")"<<"%"<<"("<<other.rel<<","<<other.vir<<"i"<<")";
    cout <<"="<<"("<<temp.rel<<","<<temp.vir<<"i"<<")"<<endl;
    return temp;
}

主函数

int main()
{
    Complex c1(9,25);
    Complex c2(3,5);
    c1.operator+(c2);
    c1.operator-(c2);
    c1.operator*(c2);
    c1.operator/(c2);
    c1.operator%(c2);
    c1.operator==(c2);
    c1.operator<(c2);
    c1.operator>(c2);
    c1.operator&&(c2);
    c1.operator||(c2);
    !(c1);
    ++(c1);
    --(c1);
    (c1)++;
    (c1)--;
    c1.show();
    return 0;
}