题目描述

输入描述

输出描述

样例输入

3 4
5 2

样例输出

-2+2i

代码填空：

#include<iostream>
using namespace std;
class complex{
    private:
    double real;
    double imag;
    public:
    complex(){
        real=0;imag=0;
    }
    complex(double r,double i)
    {
        real=r;
        imag=i;
    }
    complex operator-(complex &c2);
    void display();
};
 //pdsu-c1
 //pdsu-c1
int main()
{
    double r1,i1,r2,i2;
    //pdsu-c2
    //pdsu-c2
    return 0;
}