Question

1）编写复数类,重载加法+、减法-、乘法*等运算符,其中加法+为友元函数,其他为复数类成员函数 2)设计评

Answer 1

第一题

class Complex

{

public:

Complex():real(0),imag(0) {}

Complex(double r,double i):real(r),imag(i) {}

friend Complex operator + (Complex &,Complex &);

Complex operator - ( Complex &);

Complex operator * ( Complex &);

void display();

private:

double real;

double imag;

};

Complex operator + (Complex &c1,Complex &c2)

{

return Complex(c1.real+c2.real,c1.imag+c2.imag);

}

Complex Complex::operator - (Complex &c)

{

return Complex(real-c.real,imag-c.imag);

}

Complex Complex::operator * ( Complex &c)

{

Complex temp;

temp.real = real * c.real - imag * c.imag;

temp.imag = real * c.imag + c.real * imag;

return temp;

}

void Complex::display()

{

cout