What is a Variable? & Data Types and Value Ranges

What is a Variable?

A variable is a memory/data information field that can take/transfer different values every time the program runs, and these fields are called variables.

Variables should comply with naming conventions and should be named in a way that makes associations for the user about the value/data they store. Click here to see the naming conventions.

If we need to give examples of variables;
They should be similar to AdSoy, AdSoyad, adSoyad, Ad_Soyad.

Variables are one of the building blocks in coding and developing a program; you cannot create a program without variables, and even if you do, it will not be as efficient or advanced as a program using variables.

Data Types

Integer (Int): Data type that holds integer numbers

Float: Data type that holds decimal numbers

Bool: Data type that takes the value True or False

String: Data type made up of chars and can store words

Char: Data type that can hold only 1 letter

Value Ranges

Data types that hold integer numbers

Type	Bit	Value Range
byte	8	0 to 255
sbyte	8	-128 to 127
short	16	-32,768 to 32,767
ushort	16	0 to 65,535
int	32	-2,147,483,648 to 2,147,483,647
uint	32	0 to 4,294,967,295
long	64	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
ulong	64	0 to 18,446,744,073,709,551,615

Types that hold decimal numbers

Type	Bit	Value Range
float	32	1.5E-45 to 3.4E+38
double	64	5E-324 to 1.7E+308
decimal	128	1E-28 to 7.9E+28

Textual types

Type	Bit	Value Range
char	16	One character
string	20+(n/2)*4	Can store character chains of desired length

Logical types

Type	Bit	Value Range
bool	16	true-false

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What is a Variable? & Data Types and Value Ranges