# Number

A

*Number*is an integer such as`42`

or `-42`

. More precisely, a *Number*is a signed 32-bit integer (two's complement).### Declare a number variable

### Arithmetic operators

The following arithmetic operators work on numbers and return a Number:

- addition:
`1 + 3`

- subtraction:
`1 - 3`

- multiplication:
`3 * 2`

- integer division:
`7 / 3`

- modulo is available through the math library

### Relational operators

The following relational operators work on numbers and return a Boolean:

- equality:
`(3 + 1) = 4`

- inequality:
`3 != 4`

- less or equal than:
`3 <= 4`

- less than:
`3 < 4`

- greater or equal than :
`4 >= 3`

- greater than:
`4 > 3`

### Show number

The show number function displays a number on the LED screen. For example, this code displays the number 42:

### Functions that return a number

Some functions return a number, which you can store in a variable. For example the following code gets the display brightness (using the brightness function) and stores the value in a variable named

`brightness`

:### Math functions

The math library includes math related functions. In the Block Editor, click

`math`

on the Code Keyboard to see the math functions. For example, the `absolute`

function returns the returns the absolute value of input parameter `x`

: