想要定义一个复数类Complex，内有数据成员实部、虚部，另有成员函数，该怎么做？

Question

定义一个复数类Complex，内有数据成员实部、虚部，另有成员函数：构造函数用于初始化数据成员，输出函数，关系运算符重载“==”的重载。编写主函数：创建Complex对象，判断两个复数是否相等(实部相等、虚部也相等)。输入格式： 测试输入包含若干测试用例，每个测试用例占一行。当读入0 0 0 0时输入结束，相应的结果不要输出。输入样例：（括号内为说明）3 5 4 5（a=3+5i, b=4+5i）3 -5 3 -5（a=3-5i, b=3-5i）0 5 0 5（a=5i, b=5i）0 0 0 0输出样例：a=3+5i,b=4+5i,a不等于b↙ a=3-5i,b=3-5i,a等于b↙ a=5i,b=5i,a等于b↙

Answer 1

class complex
{
public:
complex(){real=0;imag=0;}
complex(double r){real=r;imag=0;}
complex(double r,double i){real=r;imag=i;}
friend istream & operator >> (istream &,complex &);
friend ostream & operator << (ostream &,complex &);

private:
double real;
double imag;
};
istream & operator >> (istream &input,complex &c)
{
cout<<"please input real part and imaginary part of complex number:";
input>>c.real>>c.imag;
return input;
}
ostream & operator << (ostream &output,complex &c)
{
if(c.imag>0)
if（c.real==0）output<<c.imag<<"i";
else output<<c.real<<"+"<<c.imag<<"i";
else if(c.imag<0)
if（c.real==0）output<<c.imag<<"i";
else output<<c.real<<c.imag<<"i";
else output<<c.real;
return output;
}