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。
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#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;
}
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