Data types in C Language

Data types in C:

C has different types of data types. The data type is determines how much space is occupied by variable in the storage disk.

Mainly there are two types those are Pre- defined and User Defined.

Basic data types: These are arithmetic data types Integer, Char, float and Double.

Enumerated Type: enum is the arithmetic type used to define variables used to assign certain discrete integer values throughout the program.

Void data type: Void means no value.

Derived Data types: Derived data type means these are defined by the programmer at the time of programming based on the requirement.

Arrays, pointers, structures and union.

Data Types in C:

Data Types	Size	Range
Char	1 byte	−128 to 127
signed char	1 byte	−128 to 127
unsigned char	1 byte	0 to 127
Short	2 byte	−32,768 to 32,767
signed short	2 byte	−32,768 to 32,767
unsigned short	2 byte	0 to 32,767
Int	2 byte	−32,768 to 32,767
signed int	2 byte	−32,768 to 32,767
unsigned int	2 byte	0 to 32,767
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 32,767
long int	4 byte
signed long int	4 byte
unsigned long int	4 byte
Float	4 byte
Double	8 byte
long double	10 byte

The above shows the basic data types in c.

Note: If you want to know the exact size of the variable or a type use sizeof() operator .

Below program demonstrates how to use sizeof() operator in c and know the values of basic data types.

This is basic interview question for fresher use of sizeof() operator.

#include<stdio.h>

#include<conio.h>

void main(){

printf(“size of an integer: %d \n”,sizeof(int));

printf(“size of float: %d \n”,sizeof(float));

printf(“size of Character: %d \n”,sizeof(char));

printf(“size of double: %d \n”,sizeof(double));

getch();

}

Output is :

size of an integer:2

size of float: 4

size of Character:1

size of double: 8

Press  Alt +f9 and then Ctrl+f9 to compile and run the program.

Out put of the above program is: