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WELCOME�TO�SEMINAR

ON TOPIC: BASIC DATATYPES(Built in types)

BY: Saakshi J.Shetty(20422)

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There are 3 types of Data types in C++…

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C++ datatypes

Built in Datatypes.
User defined datatypes
Derived datatypes

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Definition of built in types

The term Built-in itself tells us that these categories of data types are defined by the programming language at prior.
Built-in Data types are those data types that can be directly used by the programmer to declare and store different variables in a program.
They are also called Primary or Primitive Data Types.

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Classifications

Built-in-datatypes are of 3 types:

Integral type
Void
Floating type

Int

Char

Float

Double

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Description on built-in- datatypes

Built-in data types are the most basic data-types in C++.
The term built-in means that they are pre-defined in C++ and can be used directly in a program.
char, int, float and double are the most common built-in data types.
Apart from these, we also have void ,bool and wchar_t data types.

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Int, char, float, double, boolean, void ,wide character - are the most basic and common built-in data types in every programming language. Other than these if you want to work with complex data categories, you will have to define them yourself.

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Types and examples of built in datatypes.(integer datatype-int)

This Built-in data type represents an integer number. It does not support any decimal or fractional number. Integer numbers can contain Positive as well as Negative numbers.
Ex:- 29, -50, 1947, 50384
Syntax: int variable_name;
Example: int a;

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Character datatype-char

This data type accepts character values from the user. These characters include single letter, digit, symbol, special characters, etc enclosed within single quotes. Ex:- ‘A’, ‘$’, ‘g’, ‘5’
Syntax: char variable_name;
Example:char a;

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Float datatype-float

Float data type represents numbers that are in decimal format. They are commonly called floating-point numbers. Ex:- 25.56, 785.383, -3674.7358, -10
Syntax: float variable_name;
Example: float a;

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Double datatype- double

It is a variant of the Floating-point data type which is also used to represent fractional and decimal numbers. Ex:- 260000.7334
Syntax:- double variable_name;
Example: double a;

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Boolean Datatype-bool

This data type consists of only 2 values: True or False. It is a logical type of built-in data type. The default value of Boolean data type is False.
Ex:- True,false,0,1,2,3
Syntax: bool variable_name;
Ex:- bool x = 0; // false

bool y = 100; // true

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Void datatype: void

This data type is widely used in C and C++ languages. It indicates that it has no value/empty. This data type is mainly used as a return type for functions that do not return a value to the caller function.
Syntax:- void function_name(void)
Example:- void print()

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Wide character datatype: wchar_t

Wide char is similar to char data type, except that wide char take up twice the space and can take on much larger values as a result.
char can take 256 values which corresponds to entries in the ASCII table. On the other hand, wide char can take on 65536 values which corresponds to UNICODE values.
Just like the keyword for character constants is char, the keyword for wide character is wchar_t.
Syntax: wchar_t variable_name;
Example: wchar_t w ;

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The discussed datatypes can be classified further into following types:

Long
Short
Signed
Unsigned

For example:

short int
long int
signed int
unsigned int
signed char
unsigned char
unsigned short int
signed short int

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Sizes of each datatype:

Sno	Datatypes	Sizes(in bytes)
1	void	0
2	char	1
3	bool	1
4	int	2
5	wchar_t	2
6	float	4
7	double	8