What are the syntax rules for expressions in C language?

What are the grammatical rules of C language expressions

The grammatical rules of C language expressions are as follows:

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(1) The C source program is composed of a main function and several other functions.

(2) There must be parentheses after the function name, and the function body must be placed within curly brackets.

(3) C programs must be written in lowercase letters.

(4) Add a semicolon at the end of each sentence.

(5) You can have multiple sentences in one line.

(6) can be one sentence or multiple lines.

(7) You can add comments anywhere in the program. A complete C language program is composed of a main() function (also called the main function) and several other functions, or only one main() function.

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