Kotlin Operators
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:
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)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 » |
| - | Subtraction | Subtracts one value from another | x - y | Try it » |
| * | Multiplication | Multiplies two values | x * y | Try it » |
| / | Division | Divides one value from another | x / y | Try it » |
| % | Modulus | Returns the division remainder | x % y | Try it » |
| ++ | Increment | Increases the value by 1 | ++x | Try it » |
| -- | Decrement | Decreases the value by 1 | --x | Try it » |
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:
The addition assignment operator (+=) adds a value to a variable:
A list of all assignment operators:
| Operator | Example | Same As | Try it |
|---|---|---|---|
| = | x = 5 | x = 5 | Try it » |
| += | x += 3 | x = x + 3 | Try it » |
| -= | x -= 3 | x = x - 3 | Try it » |
| *= | x *= 3 | x = x * 3 | Try it » |
| /= | x /= 3 | x = x / 3 | Try it » |
| %= | x %= 3 | x = x % 3 | Try it » |
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 » |
| != | Not equal | x != y | Try it » |
| > | Greater than | x > y | Try it » |
| < | Less than | x < y | Try it » |
| >= | Greater than or equal to | x >= y | Try it » |
| <= | Less than or equal to | x <= y | Try it » |
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 » |
| || | Logical or | Returns true if one of the statements is true | x < 5 || x < 4 | Try it » |
| ! | Logical not | Reverse the result, returns false if the result is true | Try it » |
