c++ 运算符重载的题目

Question

定义一个复数类，通过重载运算符：“*、/”，直接实现二个复数之间的乘除运算。
编写一个完整的程序，测试重载运算符的正确性。要求乘法“*”用友元函数实现重载，除法“/”用成员函数实现重载。
要测试过的没错误的，帮我把错误改掉，行吗？

Answer 1

#include<iostream.h>
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r;imag=i;}
friend Complex operator*(Complex &c1,Complex &c2);
Complex operator/(Complex &c);
//重载了输出操作符以方便输出
friend ostream& operator<<(ostream &output,Complex &c);
private:
double real;
double imag;
};

Complex operator*(Complex &c1,Complex &c2)
{
double newReal,newImag;
newReal=c1.real*c2.real-c1.imag*c2.imag;
newImag=c1.real*c2.imag+c1.imag*c2.real;
return Complex(newReal,newImag);
}

Complex Complex::operator/(Complex &c)
{
double newReal,newImag,demo;
demo=c.real*c.real+c.imag*c.imag;
if(demo!=0)
{
newReal=(real*c.real+imag*c.imag)/demo;
newImag=(imag*c.real-real*c.imag)/demo;
return Complex(newReal,newImag);
}
}
ostream& operator<<(ostream &output,Complex &c)
{
output<<"("<<c.real;
if(c.imag>=0)
output<<"+";
output<<c.imag<<"i)"<<endl;
return output;
}

void main()
{
Complex c1(2,-1),c2(1,1),c3,c4;
c3=c1*c2;
c4=c1/c2;
cout<<"复数的积:"<<c3<<endl;
cout<<"复数的商:"<<c4<<endl;
}
报什么错误，我的编译器（VC++6）上没问题啊？
我亲自运行过。