# Number

An number value.

A Number is a numeric value that is an integer or a rational number. Numbers are stored in multiple bytes in floating point format. This is so that numbers with a fractional portion can have precise calculations perfomed on them.

Some examples of different types of number values:

• 67 - positive integer
• -345 - negative integer
• 0 - zero
• 19.43 - floating point
• -45.245 - negative floating point
• 0.4567 - fractional floating point
• 8.23e+21 - floating point with exponent notation

### Declare a number variable

You can assign a number to a variable:

``````let num = 42;
basic.showNumber(42);``````

For example the following code gets the display brightness (using the brightness function) and stores the value in a variable named `brightness`:

``let brightness = led.brightness()``

### 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:

``basic.showNumber(42);``