C Data Types Examples

 C Data Types – Examples (Beginner → Practical)

In C language, data types specify what kind of data a variable can store, how much memory it uses, and what operations are allowed on it.

Below are clear examples of all major C data types, exactly the way they are asked in exams & interviews.

 Basic (Primitive) Data Types

int – Integer Data Type

Stores whole numbers.

 Size: usually 4 bytes

float – Floating Point

Stores decimal numbers (single precision).

 Size: 4 bytes

double – Double Precision Float

Stores large decimal values with high precision.

 Size: 8 bytes

char – Character Data Type

Stores single character.

 Size: 1 byte
 Stored internally as ASCII value

 Derived Data Types

 Array Example

•  Stores multiple values of same type

 Pointer Example

•  Stores address of variable

 Structure Example

•  Stores different data types together

 Union Example

•  Shares same memory location

 Enumeration (enum) Data Type

•  Used for named integer constants

void Data Type

 Function Returning Nothing

void Pointer

•  Represents no type

 Type Modifiers (Extended Data Types)

short, long, signed, unsigned

•  Modify range & size

 Boolean Type (stdbool.h)

• true → 1
• false → 0

 Size of Data Types (Example)

 Interview-Focused Summary Table

 Common Mistakes

• Using wrong format specifier

• Confusing float and double

• Forgetting & in scanf()

• Assuming same size on all systems

 Final Summary

•  Data types define type, size & range of data
•  C has basic, derived, and user-defined types
•  Choosing correct data type improves performance & safety
•  Very important for exams, interviews & real projects