309a.cpp

C++实训教程

//	309a.cpp  成员函数的实现方式与309.cpp不同
#include <iostream.h>
class C			//Complex
{
   private:
   	double r,i;
   public:
	C();
	C(double x,double y=0);
	void Init(double a=0,double b=0);
	double GetReal();
	double GetImag();
	void Disp()
	{
	  	cout << r ;
	  	if (i>=0) cout << "+" ;
	  	cout << i << "i\n";
	}
	void Multi(double m);

	void AddReal(double x);
};

C::C(){r=0;i=0;}
C::C(double x,double y){ r=x;i=y ;}
void C::Init(double a,double b){ r=a; i=b;}
double C::GetReal(){ return r;}
double C::GetImag(){ return i;}
void C::Multi(double m){   r=r*m;  i=i*m;}
void C::AddReal(double x){r+=x;}

main()
{
   C a,b,c,*p;
   p=&a;
   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
*/