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This article mainly explains "the definition and usage of C language # define grammar". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the definition and usage of C language # define grammar".

# definition of define:

# define is a preprocessing instruction in C language, where the "#" indicates that this is a preprocessing command. Everything that starts with "#" is a preprocessing command, "define" defines a command for a macro, and "identifier" is a defined macro name.

# define TIME_NUM 1000 / / define a number of time

A simple TIME_NUM is defined, which represents 1000, if you write it in the program:

If (I)

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