项目1任务三

#include <iostream>
using namespace std;
class Complex{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    friend Complex  operator+(double c1,Complex &c2);
    friend Complex  operator-(double c1,Complex &c2);
    friend Complex  operator*(double c1,Complex &c2);
    friend Complex  operator/(double c1,Complex &c2);
    friend Complex  operator-(Complex &c2);
    void display();
private:
    double real;
    double imag;

};
Complex operator+(double c1,Complex &c2){
   return Complex(c1+c2.real,c2.imag);

}
Complex  operator-(double c1,Complex &c2){
   return Complex(c1-c2.real,c2.imag);

}
Complex  operator*(double c1,Complex &c2){
   return Complex(c1*c2.real,c1*c2.imag);

}
Complex  operator/(double c1,Complex &c2){
    double d=c2.imag*c2.imag+c2.real*c2.real;
   return Complex(c1*c2.real/d,-c1*c2.imag/d);

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


}
void Complex::display(){
    if(imag>0)
cout<<real<<"+"<<imag<<"i"<<endl;
else
    cout<<real<<imag<<"i"<<endl;
}
int main()
{
    Complex c1(1,2),c2(3,-4),c3(2,3),c4(4,-2),c5,c6,c7,c8,c9(2,-3),c10;
    c5=1.2+c1;
    c5.display();
    c6=2.3-c2;
    c6.display();
    c7=2.1*c3;
    c7.display();
    c8=2.5/c4;
    c8.display();
    c10=-c9;
    c10.display();
    return 0;
}

运行结果：