本文主要是介绍C++ 常用的头文件，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

cmath.h

• This is a Standard C++ Library file. You should @c #include this file
• in your programs, rather than any of the @a *.h implementation files.
• This is the C++ version of the Standard C Library header @c math.h,
• and its contents are (mostly) the same as that header, but are all
• contained in the namespace @c std (except for names which are defined
• as macros in C).

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