Data Types in C

Programming Data Types

Data types are the keywords, which are used for assigning a type to a variable.

Data types in C

Fundamental Data Types

·        Integer types

·        Floating Type

·        Character types

Derived Data Types

·        Arrays

·        Pointers

·        Structures

·        Enumeration

Syntax for declaration of a variable data type variable name

1) Integer data types:-

Keyword int is used for declaring the variable with integer type. For example:

int var1;

Here, var1 is a variable of type integer.

The size of int is either 2 bytes or 4 bytes.

If you consider an integer having size of 4 byte( equal to 32 bits),

2) Floating types:-

Variables of floating types can hold real values(numbers) such as: 2.34, -9.382 etc. Keywords either float or double is used for declaring floating type variable. For example:

float var2;

double var3;

Here, both var2 and var3 are floating type variables.

In C, floating values can be represented in exponential form as well. For example:

float var3=22.442e2

3) Character types

Keyword char is used for declaring the variable of character type. For example:

char var4='h';

Here, var4 is a variable of type character which is storing a character 'h'.

Size of data types

DataType	Storage size	Value range
char	1 byte	-128 to 127 or 0 to 255
unsigned char	1 byte	0 to 255
signed char	1 byte	-128 to 127
int	2 or 4 bytes	-32,768 to 32,767 or -2,147,483,648 to 2,147,483,647
unsigned int	2 or 4 bytes	0 to 65,535 or 0 to 4,294,967,295
short	2 bytes	-32,768 to 32,767
unsigned short	2 bytes	0 to 65,535
long	4 bytes	-2,147,483,648 to 2,147,483,647
unsigned long	4 bytes	0 to 4,294,967,295

//Write a program to find the size of integer datatype
 #include<stdio.h>
#include<conio.h>
void main()
{
int x;
printf("value of int = %d",sizeof (x));
getch();
}
OUTPUT:-
Value of int = 2

// Write a program to find the size of char data type
#include<stdio.h>
#include<conio.h>
#include<limits.h>
void main()
{
char x;
printf("value of char=%d",sizeof (x));
getch();
}
OUTPUT:- 
value of char = 1