504.cpp

C++实训教程

//504.cpp demo calling new and without a copy constructor:hide problem .
#include <iostream.h>
#include <string.h>
class C
{
	int ni;  char* s;
  public:
	C() {s = (char*)0;ni = 0; }
	C(char* name)
	{
		s = new char[strlen(name) + 1];
		if (s)strcpy(s, name);
		ni = 0;  
	}
	C(char* name, int a)
	{
		s = new char[strlen(name) + 1];
		if (s)  strcpy(s, name);
		ni = a;  
	}
	~C()  {delete s; }
	void Display(){ cout << "Data = " << ni << "  string = " << s << endl; }
	unsigned GetAddress() 
	{ return (unsigned) s; }
};
void main()
{
	C o1 = "S1";C o2 = o1;   C o3("S3" , 30);
	o1.Display();   o2.Display();   o3.Display();
	cout << o1.GetAddress() << endl;
	cout << o2.GetAddress() << endl;
	cout << o3.GetAddress() << endl;
}
/*
Data = 0  string = S1            
Data = 0  string = S1
Data = 30  string = S3
6695400
6695400
6695416
*/