Data Types in C Programming - A Beginner Guide with examples

What are Data Types?

A data type specifies the kind of value a variable can hold and how much memory it occupies.

Primary (Basic) Data Types

• int — whole numbers, e.g. int age = 25;
• float — single-precision decimal numbers, e.g. float price = 19.99;
• double — double-precision decimal numbers.
• char — a single character, e.g. char grade = 'A';
• void — represents "no value", commonly used for functions that return nothing.

Derived Data Types

Arrays, pointers, functions, and structures — built from primary types.

User-Defined Data Types

struct, union, enum, and typedef.

int marks = 90;
float pi = 3.14f;
char letter = 'Z';