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Kotlin Operators

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Kotlin Operators

Operators are used to perform operations on variables and values.

The value is called an operand, while the operation (to be performed between the two operands) is defined by an operator:

Operand Operator Operand
100 + 50

In the example below, the numbers 100 and 50 are operands, and the + sign is an operator:

Example

var x = 100 + 50
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Although the + operator is often used to add together two values, like in the example above; it can also be used to add together a variable and a value, or a variable and a variable:

Example

var sum1 = 100 + 50       // 150 (100 + 50)
var sum2 = sum1 + 250     // 400 (150 + 250)
var sum3 = sum2 + sum2    // 800 (400 + 400)
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Kotlin divides the operators into the following groups:

  • Arithmetic operators
  • Assignment operators
  • Comparison operators
  • Logical operators

Arithmetic Operators

Arithmetic operators are used to perform common mathematical operations.

Operator Name Description Example Try it
+ Addition Adds together two values x + y Try it ยป
- Subtraction Subtracts one value from another x - y Try it ยป
* Multiplication Multiplies two values x * y Try it ยป
/ Division Divides one value from another x / y Try it ยป
% Modulus Returns the division remainder x % y Try it ยป
++ Increment Increases the value by 1 ++x Try it ยป
-- Decrement Decreases the value by 1 --x Try it ยป

Kotlin Assignment Operators

Assignment operators are used to assign values to variables.

In the example below, we use the assignment operator (=) to assign the value 10 to a variable called x:

Example

var x = 10
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The addition assignment operator (+=) adds a value to a variable:

Example

var x = 10
x += 5
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A list of all assignment operators:

Operator Example Same As Try it
= x = 5 x = 5 Try it ยป
+= x += 3 x = x + 3 Try it ยป
-= x -= 3 x = x - 3 Try it ยป
*= x *= 3 x = x * 3 Try it ยป
/= x /= 3 x = x / 3 Try it ยป
%= x %= 3 x = x % 3 Try it ยป

Kotlin Comparison Operators

Comparison operators are used to compare two values, and returns a Boolean value: either true or false.

Operator Name Example Try it
== Equal to x == y Try it ยป
!= Not equal x != y Try it ยป
> Greater than x > y Try it ยป
< Less than x < y Try it ยป
>= Greater than or equal to x >= y Try it ยป
<= Less than or equal to x <= y Try it ยป

You will learn much more about Booleans in the Boolean chapter and Conditions.

Kotlin Logical Operators

Logical operators are used to determine the logic between variables or values:

Operator Name Description Example Try it
&&  Logical and Returns true if both statements are true x < 5 &&  x < 10 Try it ยป
||  Logical or Returns true if one of the statements is true x < 5 || x < 4 Try it ยป
! Logical not Reverse the result, returns false if the result is true Try it ยป
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