C++文法

C++的文法過於精巧，以致很多同學不能很好地理解。本文舉幾個小例子，供讀者思考。

1、  inline和virtual

#include <iostream>

class A

{

public:

     virtual inline void func()

     {

         std::cout << "A::func" << std::endl;

     }

};

class B:public A

{

public:

     virtual inline void func()

     {

         std::cout << "B::func" << std::endl;

     }

};

int main(int argc,char *argv[])

{

     A().func();

     B().func();

     A *p=new B();

     p->func();

     delete p;

}

2、  全域內建變數、靜態內建變數、局部內建變數、寄存器內建變數、動態分配的內建變數的初始化問題

#include <iostream>

int a;

int &b(){static int result;return result;}

int main(int argc,char *argv[])

{

     int c;

     register int d;

     int &e=*new int;

     std::cout << a << std::endl;

     std::cout << b() << std::endl;

     //std::cout << c << std::endl;

     //std::cout << d << std::endl;

     std::cout << e << std::endl;

     delete &e;

}