C++习题-运算符重载[4.3]

    定义一个复数类Complex,重载运算符“+”，使之能用于复数的加法运算。参加运算的两个运算符可以都是类对象，也可以其中有一个是整数，顺序任意。例如：c1 + c2,i + c1,c1 + i均合法(设i为整数，c1,c2为复数)。编写程序，分别求两个复数之和、整数和复数之和。

#include <iostream>
using namespace std;

//复数类

class Complex
{
      public:
      Complex(){real = 0;imag = 0;}
      Complex(double r){real = r;imag = 0;}
      Complex(double r,double i){real = r;imag = i;}
      void display();
      friend Complex operator +(Complex c1,Complex c2);//重载操作符+

      private:
      double real;
      double imag;
};

void Complex::display()
{
    cout << "(" << real << "," << imag << "i)" << endl;
}

Complex operator +(Complex c1,Complex c2)
{
    Complex c;
    c.real = c1.real + c2.real;
    c.imag = c1.imag + c2.imag;
    return c;
}

int main()
{
    Complex c1(3,4),c2(5,-10);
    Complex c7;
    c7 = c1 + 3.3;
    cout << "c1=";c1.display();
    cout << "c2=";c2.display();
    cout << "c1 + 3.3=";c7.display();
    system("pause");
    return 0;
}