自考新教材--p154

源程序：

//

//  main.cpp

//  p154

//

//  Created by duanqibo on 2019/12/18.

//  Copyright © 2019年 duanqibo. All rights reserved.

//

#include <iostream>

using namespace std;

class myComplex

{

private:

    double real,imag;

public:

    myComplex()

    {

        real=0;

        imag=0;

    }

    myComplex(double r,double i)

    {

        real=r;

        imag=i;

    }

    void outCom();

    myComplex operator-(const myComplex &c);

    

    friend myComplex operator+(const myComplex &c1,const myComplex &c2);

    friend myComplex operator-(const myComplex &c1,const myComplex &c2);

    friend myComplex operator-(const myComplex &c1,double r);

    friend myComplex operator-(double r,const myComplex &c1);

};

myComplex operator+(const myComplex &c1,const myComplex &c2)

{

    return myComplex(c1.real+c2.real,c1.imag+c2.imag);

}

myComplex operator-(const myComplex &c1,const myComplex &c2)

{

    return myComplex(c1.real-c2.real,c1.imag-c2.imag);

}

myComplex operator-(const myComplex &c1,double r)

{

    return myComplex(c1.real-r,c1.imag);

}

myComplex operator-(double r,const myComplex &c1)

{

    return myComplex(r-c1.real-r,-c1.imag);

}

void myComplex::outCom()

{

    cout<<"("<<real<<","<<imag<<")";

}

int main(int argc, const char * argv[])

{

    // insert code here...

    myComplex c1(1,2),c2(3,4),res;

    c1.outCom();

    cout<<"operator+";

    c2.outCom();

    cout<<"=";

    res=c1+c2;

    res.outCom();

    cout<<endl;

    res=c1-5;

    res.outCom();

    cout<<endl;

    res=5-c1;

    res.outCom();

    cout<<endl;

    return 0;

}

 运行结果：