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来自「C实现的MUD,对大家基本入门网络游戏很有帮助!」· 代码 · 共 7 行

A preprocessor directive is any line of an LPC program which begins with '#'.

These aren't really actually statements; they just instruct the compiler to
do certain things while compiling the code.  For example, the #if statement
can be used to compile certain sections of the code only if certain conditions
are true.