C++源码：类的应用实例-复数

// Example for  Class  类的实例
//  Complex            定义 复数类
#include <iostream>
using namespace std;

class  complex
   {
    private:     //Default is private!
     float r,i;
    public:
    
     complex operator+(complex c1);   //Overload "+"
     complex operator-(complex c2);   //Overload "-"
     void init(float rr,float ii);
     void show(void);

};

complex complex::operator+(complex c1)
    {
     complex temp;
     temp.r=r+c1.r;
     temp.i=i+c1.i;
     return temp;
    }

complex complex::operator-(complex c2)
    {
     complex temp;
     temp.r=r-c2.r;
     temp.i=i-c2.i;
     return temp;
    }
  void  complex::init(float rr,float ii)
    {
     r=rr;
     i=ii;
    }
  void complex::show(void)
    {
     if (i>=0)
       cout<<"\nThe complex is:"<<r<<"+"<<i<<"i\n\n";
   else
       cout<<"\nThe complex is:"<<r<<"+("<<i<<")i\n\n";
    }

main()
{
 complex cc1,cc2,cc3,cc4;
 float x=1,y=1;

while (x!=1000.0)
 {

cout<<"\007"<<"Please input the real,i part vallue of COMPLEX:"<<flush;
 cin>>x>>y;

// PROCESS  USER WANT TO EXIT    (1)
 if  (x==0)
  {
   cout<<"  \n\n You want to EXIT !\n    BeCAUSE YOU INPUT X=0,Y=0";
   return 1;
  }

cout<<"\nThe Complex CC1 YOU INPUT is:"<<x<<"+"<<y<<"i\n";
 cc1.init(x,y);

cout<<"\007"<<"Please input the real,i part vallue of COMPLEX:"<<flush;
 cin>>x>>y;
 cout<<"\nThe Complex CC2 YOU INPUT is:"<<x<<"+"<<y<<"i\n";
 cc2.init(x,y);

/*  cc1.r=1.0; cc1.i=1.0;
     cc2.r=2.0; cc2.i=2.0;  */
 /*
 cc1.init(1.0,1.0);   // \\
 cc2.init(2.0,2.0);   // \\   */

cout<<"\n   After cc.init()";
 cout<<"\nComplex CC1:";
 cc1.show();
 cout<<"\nComplex CC2:";
 cc2.show();

cc3=cc1+cc2;
 cc4=cc2-cc1;

/* cout<<"\nCC3="<<cc3.r<<"+"<<cc3.i<<"i\n";
    cout<<"\nCC3="<<cc3.r<<"+"<<cc3.i<<"i\n"; */

cout<<"\nComplex  PLUS:cc2+cc1=";
 cc3.show();
 cout<<"\nComplex  CC2-cc1=";
 cc4.show();

}   //end while

return 0;
}           //  end main