"Macro" in C Language"

The macro definition in C language is: Define
The define macro definition in C language is in the form of parameters or parameters.
The format without parameters is: # define macro name string
The parameter format is: # define macro name (parameter 1, parameter 2,...) String
In the C language, macro definitions only use macro names instead of syntax checks. Therefore, they are not c statements. Therefore, you do not need to add ";" to macro definitions ";"
Macros are also called preprocessing commands in c, because macros are ProgramThe character is replaced before compilation, so it is called preprocessing. There are other preprocessing commands in c, such:
# Define
# UNDEF
# Ifdef
And so on.