1. Keywords: Keywords are reserved words in C programming that have special meanings and cannot be used as identifiers. Examples of keywords in C include "int," "if," "else," "for," and "while."
2. Identifiers: Identifiers are user-defined names given to variables, functions, and other entities in a C program. Identifiers must start with a letter or underscore and can contain letters, digits, and underscores.
3. Constants: Constants are fixed values that do not change during the execution of a program. There are different types of constants in C, such as integer constants, floating-point constants, character constants, and string constants.
4. Operators: Operators are symbols used to perform operations on operands in C programming. Examples of operators in C include arithmetic operators (+, -, *, /), relational operators (==, !=, <, >), logical operators (&&, ||, !), and assignment operators (=, +=, -=).
5. Punctuation: Punctuation tokens in C programming include symbols such as commas (,), semicolons (;), parentheses (()), braces ({ }), and brackets ([]). These symbols are used to separate elements of a program, define control structures, and specify data types.