What number must the preprocessing commands in C language start with?

The concept of preprocessing in programming languages: processing before compilation. There are three main aspects of preprocessing in C language: 1. Macro definition; 2. File inclusion; 3. Conditional compilation. Preprocessing commands begin with the symbol "#".

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The characteristics of compilation preprocessing commands are:

①In order to distinguish general statements, preprocessing All processing command lines must start with # and do not end with a semicolon;

② Preprocessing commands can be placed anywhere in the program;

③ All statements starting with # in the program They are all preprocessing command lines.

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