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Important terms in C

 Tokens 
 In C programming language, tokens are the basic building blocks of a program. Tokens can be classified into several categories, and one important category is identifiers.
 Identifiers: -Identifiers are names used to identify variables, functions, types, labels, etc. 
 Rules for identifiers in C: 
  •  Must start with a letter (a-z or A-Z) or underscore (_). 
  •  Can be followed by letters, digits (0-9), or underscores. 
  •  Cannot be a keyword. 
  •  Case-sensitive (e.g., "my Variable" and "my variable" are different identifiers). 
 Keywords: -Keywords are reserved words with predefined meanings in the C language.
 Total 32 Keywords in C. 
  Examples: if, else, for, while, int, char, etc.




































     









 
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                                           List of 32 C keywords
 Constants: -Constants represent fixed values that cannot be modified during the execution of a program.
 Examples: 





integer constants (e.g., 123, 0xFF), 

floating-point constants (e.g., 3.14, 1.0e-5), 

character constants (e.g., 'A', '\n'), 

string constants (e.g., "Hello", "C programming"), etc. 


 Operators and Punctuators:
  •  Operators perform various operations on operands. 
  •   Punctuators are symbols with special meanings in the C language. 
  • Examples: +, -, *, /, =, ==, ++, --, ,, ;, (, ), {, }, etc. 
 String literals: -String literals represent sequences of characters enclosed in double quotes. Example: "Hello, World!".

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