309.cpp

C++实训教程

/*
	309.cpp
	一个典型例子 An  example of design a class
*/
#include <iostream.h>
class C			//Complex
{
   private:
   	double r,i;
   public:
	C(){r=0;i=0;}
	C(double x,double y=0)
	{ r=x;i=y ;}
	void Init(double a=0,double b=0)
	{ r=a; i=b;}
	double GetReal(){ return r;}
	double GetImag(){ return i;}
	void Disp();
	void Multi(double m)
	{   r=r*m;  i=i*m;}
	void AddReal(double x){r+=x;}
};
void C::Disp()
{
  	cout << r ;
  	if (i>=0) cout << "+" ;
  	cout << i << "i\n";
}

main()
{
   C a,b,c,*p;
   //a.r=2.1;   not accesible  a.x=1.2;
   p=&a;
   //cout << a.x<< endl;
   a.Init(3,3);
   p->Disp();
   b.Init(4);
   c.Init(-5,-5);
   c.Multi(10);
   cout << "c=" << c.GetReal() << "+"
	   <<c.GetImag() << "i"<<endl;
   a.Disp();

   return 0;
}
/* 
3+3i
c=-50+-50i
3+3i
*/