C语言实现for each循环，是通过宏定义实现的，已经在gcc和VC++6.0测试通过。-C language for each loop is implemented by the macro definition has been adopted by the gcc and VC++6.0 testing.

VC++一个非常实用多态的小例子，提供大家熟悉C语言多态特性的使用。-VC++ A very practical example of polymorphic small to provide everyone familiar with the C language the use of multi-modal characteristics.