4. Expressions
In terms of expressions, C is a normal language.
4.1 Identifiers
C identifiers start with a letter (or an underlined blank) and can continue with letters, numbers or underlined blanks. Only the first thirty-one letters are discriminating for the compiler, which differentiates between upper and lower case. There are thirty-two reserved keywords that cannot be used as identifiers (see Box 1).
In C99, the following keywords have been added: inline, restrict, _Bool, _Complex and _Imaginary.
We also advise against using identifiers for functions or macros predefined in standard libraries, as well as names beginning with underlined blanks, not forgetting the traditional asm...
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References
- (1) - KERNIGHAN (B.W.), RITCHIE (D.M.) - The C Programming Language. - Prentice-Hall (1978).
- (2) - HARBISON (S.P.), STEELE (G.L.) - C : A Reference Manual. - Prentice-Hall (1991).
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