Explain rules for constructing variable names in c language, C/C++ Programming

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Explain Rules for constructing variable names?

The Rules for constructing variable names :

a) A variable name is any combination of alphabets, 0 to 9 digits and underscores.

b) The first character in the variable name should be an alphabet.

c) No blanks or commas all allowed within a variable name.

d) No other than an underscore special symbol can be used in a variable name.

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