学步园

#include <iostream.h>

class  Complex 
{
    double re;
    double im;
public:
    Complex(double r,double i):re(r), im(i)
    { };
    Complex( )
    { 
        re = 0;
        im = 0;
    }
    friend Complex operator+( const Complex &obj1, const Complex &obj2 );
    friend Complex operator-( const Complex &obj1, const Complex &obj2 );

    void print();
};

Complex operator+( const Complex &obj1, const Complex &obj2 )
{
     Complex  temp;
     temp.re = obj1.re + obj2.re;
     temp.im = obj1.im + obj2.im;
     return temp;
}

Complex operator-( const Complex &obj1, const Complex &obj2 )
{
     Complex  temp;
     temp.re = obj1.re - obj2.re;
     temp.im = obj1.im - obj2.im;
     return temp;
}

void Complex::print()
{
    cout << re;
    if(im > 0)
        cout << "+" << im << "i" << endl;
    else
        cout << im << "i" << endl;
}

void main( )
{
    Complex obj1(1,2),obj2(3,4);

    Complex obj3 = obj1 + obj2;
    obj3.print();
    cout<<endl;

    Complex obj4 = obj1 - obj2;
    obj4.print();
    cout<<endl;
}