Scala - Variables and Data Types

Scala Variables

Variable is a name which is used to refer memory location. Some space in memory is reserved when a variable is created.
Types of variables in Scala
1. Mutable Variable 
It is a variable whose value can be changed. It is declared using var keyword.
Example -1:

var sum = 50  
sum = 60  // It works, No error.

Example-2:

   val sum:Int = 50  // Data type specified explicitly

Note : Scala is a type infers language. So it is not required to specify data type explicitly.

2. Immutable Variable
It is a variable whose value can not be changed. It is declared using val keyword.
Example-3:

   val sum = 50  
   sum = 50  // Error: reassignment to val

Data Types 

Data Type	Default Value	Size
Boolean	False	True or false
Byte	0	8 bit signed value (-27 to 27-1)
Short	0	16 bit signed value(-215 to 215-1)
Char	'\u0000'	16 bit unsigned Unicode character(0 to 216-1)
Int	0	32 bit signed value(-231 to 231-1)
Long	0L	64 bit signed value(-263 to 263-1)
Float	0.0F	32 bit IEEE 754 single-precision float
Double	0.0D	64 bit IEEE 754 double-precision float
String	Null	A sequence of characters