What are the data types and how many types of it?

Updated on 10 June 2020

By COMPUTER PROGRAMMING 2020

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Updated on 10 June 2020

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In programming, data types are declarations for variables. This determines the type and size of data associated with variables.

In JAVA, Data types in two groups:-

1.Primitive data types :-

Byte, short, int, long, float, double, char and boolean

2.Non-primitive data types :-

string, arrays, class

Data Type in C++

1.User derived Data Type- Structure, Union, Enum

2.Built in Data Type- int, char, float, double Boolean, void, wide character

3.Derived Data Type- Array, Function, Pointer

Size and Range of Data Types in C

Type	Size(bits)	Range
Char or signed char	8	-128 to 127
Unsigned char	8	0 to 255
Int or signed int	16	-32,768 to 32,767
Unsigned int	16	0 to 65535
Float	32	3.4E -38 to 3.4E +38
Double	64	1.7E – 308 to 1.7E + 4932

Integer Data Type:-

Integers are whole numbers with a range of values. It represented by int. In C, There are three classes of integers storage, that are short int, int and long int in both signed and unsigned forms

Commas, decimals and special signs not allowed.

Examples:-

VALID	0	5	-10	+24	1000	+47
INVALID	$4567	2.4	1,456	9.	1,789.50	9,567,560

Example:-

int num = 100;

Characters

The char data type is used to store a single character. Characters are usually stored in 8 bits (1 byte) of internal storage. The character represented by single quotes, like 'A' or 'd'

Float

Floating point numbers are defined by keyword float

Examples:

float num = 1.789;

double num = 10008.90898;

void type

It has no value. This is usually used to specify the type of functions. The type of the function is to be void

DATA TYPES and VARIABLES declaration in C

Example

int a = 4000; // positive integer data type

float b = 5.789; // float data type

char c = 'p'; // char data type

long d = 41657; // long positive integer data type

int e = -185; // -ve integer data type

double f = 4.1234567890; // double float data type

float g = -3.55; // float data type

User-Defined Data Types:

These data types are defined by user itself. Like, defining a class in C++ or a structure. In C++ there are different user defined data types:

·Class

·Typedef defined DataType

·Structure

·Union

·Enumeration

In C , Some examples of type definition are:-

typedef int units;

typedef float marks;

Here, units symbolizes int and marks symbolizes float. They can be later used to declare variables:-

units batch1, batch2;

marks name1[50], name2[50];

Another user defined data type is enumerated data type :-

Enum identifier {value1, value2,…valuen};

Derived Data Type-

Array, Function, Pointer

Data Types	Description
Arrays	Arrays are sequences of data items having homogeneous values. They have adjacent memory locations to store values.
Pointers	In C , which are used to access the memory and deal with addresses.