Data Type in C

Data types are keywords. But every keywords are not data type. Data types are keywords which specify the nature of data or type of the data. Data type are also used to specify the size of data. Keywords mean some English alphabets which have predefine meaning in C.

Table of data types

Data Types Storage size in byte
int 2 byte
float 4 byte
char 1 byte
double 8 byte
long 4 byte

Data Types are two types

Primary Data Types:

Primary data are the data types which allow to store single value. It is also called primitive data type and primitive data types have first priority.

Example of Primary Data Type:


	short, int, double, float, long, char, void;

Secondary data type:

In secondary data type we have further two types of data type. Which will allow to store multiple data or values.

Derived Data type

Derived data type are already exist in C.

Example of Derived data types:


	arrays, pointer, function;

User Define Data type

User define data type are optional. It is defined by the users.

Example of User define data type:


	struct, enum, union;

Integer type

Integers are used to store whole numbers.

Size and range of Integer type on 16-bit machine

Type Size(bytes) Range
int or signed int 2 -32,768 to 32767
unsigned int 2 0 to 65535
short int or signed short int 1 -128 to 127
long int or signed long int 4 -2,147,483,648 to 2,147,483,647
unsigned long int 4 0 to 4,294,967,295

Floating type

Floating types are used to store real numbers.

Size and range of Floating type on 16-bit machine

Type Size(bytes) Range
Float 4 3.4E-38 to 3.4E+38
double 8 1.7E-308 to 1.7E+308
long double 10 3.4E-4932 to 1.1E+4932

Character type

Character types are used to store characters value.

Size and range of Character type on 16-bit machine

Type Size(bytes) Range
char or signed char 1-128 to 127
unsigned char 1 0 to 255

void type

void type means no value. This is usually used to specify the type of functions.

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