第十八天第一个问题

czfznb / 2023-05-11 / 原文

问题描述：

根据以下代码段完善 ?? 处内容及程序内容，以实现规定的输出。

class Complex
{
    public:
        Complex(double r=0, double i=0):real(r), imag(i){    }
        Complex operator+( ?? ) const;//重载双目运算符'+'
        Complex operator-=( ?? ); //重载双目运算符'-='
        friend Complex operator-( ?? ) const;//重载双目运算符'-'
        void Display() const;
    private:
        double real;
        double imag;
};

void Complex::Display() const
{
    cout << "(" << real << ", " << imag << ")" << endl;
}

int main()
{
    double r, m;
    cin >> r >> m;
    Complex c1(r, m);
    cin >> r >> m;
    Complex c2(r, m);
    Complex c3 = c1+c2;
    c3.Display();
    c3 = c1-c2;
    c3.Display();
    c3 -= c1;
    c3.Display();
    return 0;
}

输入格式:

输入有两行，分别为两个复数的实部与虚部。

输出格式:

按样例格式输出结果。

输入样例:

在这里给出一组输入。例如：

4 2
3 -5

输出样例:

在这里给出相应的输出。例如：

(7, -3)
(1, 7)
(-3, 5)

代码：

#include <iostream>
using namespace std;
class Complex
{
public:
Complex(double r=0, double i=0):real(r), imag(i){ }
Complex operator+(const Complex& c) const;//重载双目运算符'+'
Complex& operator-=(const Complex& c);//重载双目运算符'-='
friend Complex operator-(const Complex& c);//重载一元运算符'-'
friend Complex operator-(const Complex& c1, const Complex& c2);//重载二元运算符'-'
void Display() const;
private:
double real;
double imag;
};

Complex Complex::operator+(const Complex& c) const
{
return Complex(real + c.real, imag + c.imag);
}

Complex& Complex::operator-=(const Complex& c)
{
real -= c.real;
imag -= c.imag;
return *this;
}

Complex operator-(const Complex& c)
{
return Complex(-c.real, -c.imag);
}

Complex operator-(const Complex& c1, const Complex& c2)
{
return Complex(c1.real - c2.real, c1.imag - c2.imag);
}

void Complex::Display() const
{
cout << "(" << real << ", " << imag << ")" << endl;
}

int main()
{
double r, m;
cin >> r >> m;
Complex c1(r, m);
cin >> r >> m;
Complex c2(r, m);
Complex c3 = c1+c2;
c3.Display(); // 输出(7, -3)
c3 = c1-c2;
c3.Display(); // 输出(1, 7)
c3 -= c1;
c3.Display(); // 输出(-3, 5)
return 0;
}