## Kotlin Addition Assignment Operator

Kotlin Addition Assignment Operator assigns left operand with the sum of left and right operands.

### Syntax

The syntax to use Addition Assignment operator is

`x += value`

where

`x`

is the variable name`+=`

is the symbol used for Addition Assignment operator`value`

is the value that we would like to add to that of in variable`x`

The above expression is equivalent to

`x = x + value`

## Examples

### Increment the value in x by 10

In the following program, we take a variable: `x`

with an initial value of `21`

. Using Addition Assignment operator, we increment the value in `x`

by `10`

.

**Kotlin Program**

```
fun main() {
var x = 21
x += 10
println(x)
}
```

**Output**

`31`

**Explanation**

```
x += 10
x = x + 10
x = 21 + 10
x = 31
```