In C programming, tokens are the smallest units of a program that have meaning to the compiler.
They are the building blocks for writing C programs.

1. Keywords
   Reserved words with special meaning.
   Example: int, return, if, while

2. Identifiers
   Names given to variables, functions, etc.
   Example: main, count, sum

3. Constants
   Fixed values that do not change during program execution.
   Example: 10, 3.14, 'A'

4. String Literals
   Sequence of characters enclosed in double quotes.
   Example: "Hello, World!"

5. Operators
   Symbols that perform operations on variables and values.
   Example: +, -, *, /, =

6. Separators (Punctuators)
   Characters that separate tokens.
   Example: ;, ,, (), {}

int sum = 10; // 'int' (keyword), 'sum' (identifier), '=' (operator), '10' (constant), ';' (separator)
printf("Hello, World!"); // 'printf' (identifier), '(' and ')' (separators), '"Hello, World!"' (string literal), ';' (separator)

Tokens are fundamental to understanding how C programs are structured and interpreted by the compiler.

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