C Language Elements :

A C program is constructed from a set of basic components known as language
elements. These elements form the smallest meaningful units of a program and
are recognized by the C compiler during the compilation process. Every valid C
program, regardless of its size or complexity, is composed using these language
elements arranged according to the syntax rules of the language.

The principal language elements in C include :
keywords, identifiers, constants, string literals, operators, and punctuation symbols.

Keywords are reserved words that have predefined meanings and serve specific purposes in the language.
Examples of keywords include int, float, if, while, and return. Because
keywords have special meanings, they cannot be used for any other purpose, such
as naming variables or functions.

Identifiers are names defined by the programmer to represent variables, functions,
arrays, and other program elements. Identifiers must follow certain rules: they
must begin with a letter or an underscore, may contain letters and digits, and
cannot be the same as a keyword.

Constants are fixed values that do not change
during program execution, such as numeric values, character constants, and string
literals.

Operators specify operations to be performed on data items, while punctuation
symbols such as braces, parentheses, commas, and semicolons are used to organize
program structure and separate program components.