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

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:-

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

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