Data Types In C

In c programming language any of the data should be declare before it can be used in program. Data types in c are used for assigning a type to a data. Data Types of any variable define how much space occupies in memory storage.

Data Types In C

Data types in c can be classified as follows :

      

                  1)      Basic Data Types

·         Integer types

·         Floating Point Types

·         Character Types

                 2)      Derived Data Types

·         Arrays

·         Pointer

·         Structures

·         Union Types

·         Function Types

Integer Data Types

Integer data types is used when the declare variable with integer type. We can declare integer data type using the “int” keyword.

Example

int abc;

Here, int is integer data type and abc is the variable.

Following detail about integer types with storage sizes and value ranges. 

Data Type	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 32767
unsigned int	2 or 4 bytes	0 to 65,535
Short	2 bytes	-32,768 to 37,767
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

Floating-Point  Data types

Floating point data type stored floating point values such as 1.25, -65.20, 0.55 etc. We can declare floating point data types using “float” or “double” keyword.

Example

float abc1;

double abc2;

Here float and double are floating point data types define and abc1 and abc2 are variable. Main difference between float and double are sizes because float size is 4 bytes and double size is 8 bytes.

Following detail about floating-point types with storage sizes and value ranges.

Data Type	Storage Size	Value Range
float	4 bytes	1.2E-38 to 3.4E+38
double	8 bytes	2.3E-308 to 1.7E+308
long double	10 bytes	3.4E-4932 to 1.1E+4932

If we want to get exact size of the data types in c language so we use the sizeof operator. Sizeof operator return the size of data types.

Example

#include <stdio.h>

#include <float.h>

 int main()

{

printf(“Size of integer type is  :  %d \n”, sizeof(int));

printf(“Size of float type is : %d” , sizeof(float));

return 0;

}

Output

Size of integer type is  :  4

Size of float type is  :  4