rules for writing variable names
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Rules for Variable Names in C
Allowed Characters:
Can include letters (uppercase and lowercase), digits (0-9), and underscores (_).
Must start with a letter or an underscore.
Cannot start with a digit.
Case Sensitivity:
Variable names are case-sensitive.
Keywords:
Cannot use reserved keywords as variable names.
Length:
No official limit, but some compilers might have their own limits.