Kotlin Operators

Operators in Kotlin

Kotlin Operators are Arithmetic Operators, Assignment Operators, Comparison Operators, and Logical Operators.

In Kotlin language, operators are used to perform operations on given values. The operations could be mathematical, logical, etc. Based on the operation and requirement, the input values can be numeric, boolean, strings, etc.

For example, Arithmetic Addition operator takes two numeric values as operands, finds the sum of the two given numbers, and returns the result.

In this tutorial, we will go through all of the operators available in Kotlin, with examples, and references to the individual tutorials for each of the operators.

Arithmetic Operators

The following table covers Arithmetic Operators in Kotlin.

Operator	Symbol	Example	Description
Addition	+	x+y	Returns the sum of x and y.
Subtraction	-	x-y	Returns the subtraction of y from x.
Multiplication	*	x*y	Returns the product of x and y.
Division	/	x/y	Returns the quotient in the division of x by y.
Modulus	%	x%y	Returns the remainder in the division of x by y.
Increment	++	++x	Returns the value of x incremented by 1.
Decrement	--	--x	Returns the value of x decremented by 1.

In the following program, we take two numbers: x, and y; and perform Arithmetic Operations on these numbers.

Kotlin Program

fun main() {
    var x = 5
    var y = 2

    val addValue = x + y
    println("x + y = $addValue")

    val subValue = x - y
    println("x - y = $subValue")

    val mulValue = x * y
    println("x * y = $mulValue")

    val divValue = x / y
    println("x / y = $divValue")

    val modValue = x % y
    println("x % y = $modValue")

    ++x
    println("++x = $x")

    --y
    println("--y = $y")
}

Output

x + y = 7
x - y = 3
x * y = 10
x / y = 2
x % y = 1
++x = 6
--y = 1

The following tutorials cover Arithmetic Operators in detail with syntax and examples.

• Kotlin Addition
• Kotlin Subtraction
• Kotlin Multiplication
• Kotlin Division
• Kotlin Modulus
• Kotlin Increment
• Kotlin Decrement

Assignment Operators

The following table covers Assignment Operators in Kotlin.

Operator	Symbol	Example	Description
Assignment	=	x=5	Assign a value of 5 to x.
Addition Assignment	+=	x+=5	Add a value of 5 to that of in x.
Subtraction Assignment	-=	x-=5	Subtract a value of 5 from that of in x.
Multiplication Assignment	*=	x*=5	Multiply a value of 5 to that of in x.
Division Assignment	/=	x/=5	Divide the value in x with a value of 5.
Modulus Assignment	%=	x%=5	Find remainder in the division of x/5 and assign the remainder to x.

In the following program, we take a variable x, and apply different assignment operators on it with a value of 5.

Kotlin Program

fun main() {
    var x: Int

    // Assignment
    x = 21
    println("x  = $x    Assignment")

    x = 21
    // Addition Assignment
    x += 5
    println("x  = $x   Addition Assignment")

    x = 21
    // Subtraction Assignment
    x -= 5
    println("x  = $x   Subtraction Assignment")

    x = 21
    // Multiplication Assignment
    x *= 5
    println("x  = $x   Multiplication Assignment")

    x = 21
    // Division Assignment
    x /= 5
    println("x  = $x   Division Assignment")

    x = 21
    // Modulus Assignment
    x %= 5
    println("x  = $x   Modulus Assignment")
}

Output

x  = 21    Assignment
x  = 26   Addition Assignment
x  = 16   Subtraction Assignment
x  = 105   Multiplication Assignment
x  = 4   Division Assignment
x  = 1   Modulus Assignment

The following tutorials cover Assignment Operators in detail.

• Kotlin Assignment
• Kotlin Addition Assignment
• Kotlin Subtraction Assignment
• Kotlin Multiplication Assignment
• Kotlin Division Assignment
• Kotlin Modulus Assignment

Comparison Operators

The following table covers Comparison Operators in Kotlin.

Operator	Symbol	Example	Description
Equal-to	==	x==y	Returns true if x and y are equal in value, or else returns false.
Not-equal	!=	x!=y	Returns true if x and y are not equal in value, or else returns false.
Greater-than	>	x>y	Returns true if value in x is greater than that of in y, or else returns false.
Less-than	<	x<y	Returns true if value in x is less than that of in y, or else returns false.
Greater-than or Equal-to	>=	x>=y	Returns true if value in x is greater than or equal to that of in y, or else returns false.
Less-than or Equal-to	<=	x<=y	Returns true if value in x is less than or equal to that of in y, or else returns false.

In the following program, we take two numbers: a, and b; and perform comparison operations on these numbers.

Kotlin Program

fun main() {
    var x = 5
    var y = 2

    println("x = $x\ny = $y")

    var result: Boolean

    // Equal-to
    result = x == y
    println("x == y   $result")

    // Not-equal
    result = x != y
    println("x != y   $result")

    // Greater-than
    result = x > y
    println("x > y    $result")

    // Less-than
    result = x < y
    println("x < y    $result")

    // Greater-than or Equal-to
    result = x >= y
    println("x >= y   $result")

    // Less-than or Equal-to
    result = x <= y
    println("x <= y   $result")
}

Output

x = 5
y = 2
x == y   false
x != y   true
x > y    true
x < y    false
x >= y   true
x <= y   false

The following tutorials cover Comparison Operators in detail.

• Kotlin Equal-to
• Kotlin Not-equal
• Kotlin Greater-than
• Kotlin Less-than
• Kotlin Greater-than or Equal-to
• Kotlin Less-than or Equal-to

Logical Operators

The following table covers Logical Operators in Kotlin.

Operator	Symbol	Example	Description
AND	&&	x&&y	Returns true if both x and y are true, else returns false.
OR	||	x||y	Returns true if at least one of x or y is true, else returns false.
NOT	!	!x	Returns true if x is false, or false if x is true.

In the following program, we take boolean values in a, and b; and perform logical operations on these values.

Kotlin Program

fun main() {
    val x = true
    val y = false
    println("x && y = ${x && y}")
    println("x || y = ${x || y}")
    println("!x = ${!x}")
}

Output

x && y = false
x || y = true
!x = false

The following tutorials cover Logical Operators in detail with syntax and examples.

• Kotlin AND
• Kotlin OR
• Kotlin NOT

More Tutorials on Operators

These are some more tutorials related to Kotlin Operators.

• Kotlin If AND
• Kotlin If OR