sizeof.cpp

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本文展示了一个使用 C++ 编写的简单类继承实例。基类 Base 和派生类 Derived 分别用于展示如何从子类中访问基类成员以及派生类如何扩展基类的功能。代码还展示了如何创建对象并调用它们的方法。

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <iostream.h>
#include <string.h>

class Base {
public:
   Base(char *message) { strcpy(Base::message, message); };
   void show_base(void) { cout << message << endl; };
private:
   char message[256];
};

class Derived: public Base {
public:
   Derived(char *dmsg, char *bmsg) : Base(bmsg) {
     strcpy(message, dmsg); };
   void show_derived(void)
   {
cout << message << endl;
     show_base();
   };
private:
   char message[256];
};

void main(void)
{
Base some_base("This is a base");
Derived some_derived("Derived message", "Base message");

cout << "The size of the base class is " << sizeof(some_base) << " bytes" << endl;
cout << "The size of the derived class is " << sizeof(some_derived) << " bytes" << endl;
}