C Data Types

In this tutorial, you will learn about what is data types and different types of data types such as int, float, char, etc. available in C programming language.


A data type refers the type of data that a variable can hold such as int, float, character, etc. This also determines the size of the data that a variable can hold in C programming language. For example,

int var1;

Here, var1 is a variable of int (integer) type and the size of the int is 4 bytes.

C Data Types

There are following data types available in C programming language.

Data Types Data Types Example
Basic Data Type int, float, char, double
Derived Data Types array, pointer, structure, union
Enumeration Data Type enum
Void Data Type void

Basic Data Types

Basic data types in C programming language mainly based on integer-based and floating-point based. C language supports both singed ang unsigned datatypes.

The size of the each data type differs based on the operating system architecture.

Here, we have mentioned most commonly used basic data types in C programming language base on 32-bit architecture.

Data Types Memory Size Range
int 2 byte −32,768 to 32,767
signed int 2 byte −32,768 to 32,767
unsigned int 2 byte 0 to 65,535
short int 2 byte −32,768 to 32,767
signed short int 2 byte −32,768 to 32,767
unsigned short int 2 byte 0 to 65,535
long int 4 byte -2,147,483,648 to 2,147,483,647
signed long int 4 byte -2,147,483,648 to 2,147,483,647
unsigned long int 4 byte 0 to 4,294,967,295
char 1 byte −128 to 127
signed char 1 byte −128 to 127
unsigned char 1 byte 0 to 255
short 2 byte −32,768 to 32,767
signed short 2 byte −32,768 to 32,767
unsigned short 2 byte 0 to 65,535
float 4 byte
double 8 byte
long double 10 byte

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