为什么＃定义不需要分号？ [英] Why does #define not require a semicolon?

问题描述

我在写一些测试code中的 C 。错误我已经插入了一个; 后的#define ，这给了我的错误。为什么不要求的#define S'

I was writing some test code in C. By mistake I had inserted a ; after a #define, which gave me errors. Why is a semicolon not required for #defines?

推荐答案

的#define 是的 preprocessor指令，不是的语句或声明的由C语法定义（这两个都要求以分号结束）。对于每一个的语法规则是不同的。

#define is a preprocessor directive, not a statement or declaration as defined by the C grammar (both of those are required to end with a semicolon). The rules for the syntax of each one are different.

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