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Introduction [cont'd]
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Identifiers in Introduction of Programming in C
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Define C Identifiers? 
Identifier are user specified names for arrays, functions, and variables. It has some structure to form identifiers.

Thus,
Identifiers should not be keywords.
Can use digits, alphabets, and underscore.
Should not start with digits
First 31 characters are allowed. Exceeded characters will be truncated
Should not contain white space character
Valid C identifiers 
user_name
_username
user1
user2
Invalid C identifiers 
user name
1user
2user
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