12_1.cpp

ThinkingC++中文版答案 ThinkingC++中文版答案

//12_1

#include <iostream.h>

class MyClass{
public:
  MyClass();
  MyClass(int);
  ~MyClass();
  void Display();
protected:
  int number;
};

MyClass::MyClass(){ cout <<"Constructing normally.\n"; }

MyClass::MyClass(int m):number(m)
{
  cout <<"Constructing with a number: " <<number <<endl;
}

void MyClass::Display(){ cout <<"Display a number: " <<number <<endl; }

MyClass::~MyClass(){ cout <<"Destructing.\n"; }

void main()
{
  MyClass obj1;
  MyClass obj2(20);

  obj1.Display();
  obj2.Display();
}