1.定义复数Complex类,使用友元,完成复数的加法、减法、乘法和除法运算,以及对复数的输出.
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#pragma once

#include

using namespace std;

class Complex

{

public:

Complex(double re=0.,double im=0.)

{

real=re;

imag=im;

}

void setreal(const double r);

void setimag(const double i);

friend Complex operator-(const Complex &);

friend istream& operator>>(istream &in,Complex &c);

friend ostream& operator(istream &in,Complex &c)

{

return in>>c.real>>c.imag;

}

ostream& operato

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