Operators

In a Computer Everything is a Number.
Strings, Images, Audio, Video are All Encoded as Numbers.

Scala does have some operators to do the basic calculations.
But with these basic thing you can do everything

• toUpperCase on a text
• darken an image
• lower the volume on audio
• calculate the average on a dataset

Arithmetic operators

val a = 5
val b = 2
val sum = a + b  // Addition operator
val difference = a - b  // Subtraction operator
val product = a * b  // Multiplication operator
val quotient = a / b  // Division operator
val remainder = a % b  // Modulus operator

Examples

scala> 
val a: Int = 4
val b: Int = 3

scala> val add = a + b
val add: Int = 7
                                                                              
scala> val subtract = a - b
val subtract: Int = 1

scala> val multiply = a * b
val multiply: Int = 12
 
scala> val divide = a / b
val divide: Int = 1

This is an integer division. So it will give an integer value.

modulo

Modulo is the rest of an integer division

scala> val modulo = a % b
val modulo: Int = 1

divide floating point

If you want a floating point division then you have to cast an Int to a Double

scala> val d: Double = a / b
val d: Double = 1.0

To change to type to a Double is no enough, also a typecast is needed: toDouble

scala> val d: Double = a / b.toDouble
val d: Double = 1.3333333333333333

Comparison operators

val x = 10
val y = 5
val isGreaterThan = x > y  // Greater than operator
val isLessThan = x < y  // Less than operator
val isEqualTo = x == y  // Equality operator
val isNotEqualTo = x != y  // Inequality operator

scala> b < 4
val res0: Boolean = true
                                                                                
scala> b > 4
val res1: Boolean = false
                                                                                
scala> b == 3
val res2: Boolean = true
                                                                                
scala> b >= 4
val res3: Boolean = false
                                                                                
scala> b <= 4
val res4: Boolean = true

Logical operators

val p = true
val q = false
val andResult = p && q  // Logical AND operator
val orResult = p || q  // Logical OR operator
val notResult = !p  // Logical NOT operator

scala> b != 4
val res5: Boolean = true
                                                                                
scala> b > 2 && b < 4
val res6: Boolean = true
                                                                                
scala> b < 2 || b > 4
val res7: Boolean = false