本文探讨了C++中预处理指令的使用，包括ifndef、define、endif和#pragma once的细节。分析了当类名相同情况下，不同的预处理指令如何影响编译过程。指出在存在多个同名.h文件时，#pragma once可能存在的局限性。
#ifndef CLASSNAME_H
#define CLASSNAME_H
#endif
This method can not solve the problem that once two classname is the same,then both of the class with same names could not be compiled.
#pragma once
This could not deal with the situation that if there are two or more .h file which are the same.
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