项目1

#include <iostream>
using namespace std;
class Complex{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    Complex  operator+(Complex &c2);
    Complex  operator-(Complex &c2);
    Complex  operator*(Complex &c2);
    Complex  operator/(Complex &c2);
    friend istream& operator >>(istream&,Complex&);
    friend ostream& operator <<(ostream&,Complex&);
private:
    double real;
    double imag;

};
istream& operator >>(istream &input,Complex &c){
   input>>c.real>>c.imag;
   return input;
}
ostream& operator <<(ostream &output ,Complex &c){
  output<<c.real;
  if(c.imag>0)
  output<<"+";
  output<<c.imag<<"i"<<endl;
   return output;
}
Complex  Complex::operator+(Complex &c2){
   return Complex(real+c2.real,imag+c2.imag);
}
Complex  Complex::operator-(Complex &c2){
   return Complex(real-c2.real,imag-c2.imag);

}
Complex  Complex::operator*(Complex &c2){
   return Complex(real*c2.real,imag*c2.imag);

}
Complex  Complex::operator/(Complex &c2){
   return Complex(real/c2.real,imag/c2.imag);

}
int main()
{
    Complex c1,c2,c3,c4,c5,c6,c7,c8;
    cin>>c1>>c2;
    c5=c1+c2;
    cout<<c5;
    cin>>c3>>c4;
    c6=c3-c4;
    cout<<c6;
    c7=c1*c2;
    cout<<c7;
    c8=c1/c2;
    cout<<c8;
    return 0;
}