72 lines
1.8 KiB
Markdown
72 lines
1.8 KiB
Markdown
# Number
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An integer number.
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### @parent blocks/language
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A *Number* is an integer such as `42` or `-42`. More precisely, a *Number* is a signed 32-bit integer (two's complement).
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### Declare a number variable
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You can assign a number to a variable:
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```blocks
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let num = 42;
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basic.showNumber(42);
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```
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### Arithmetic operators
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The following arithmetic operators work on numbers and return a [Number](/reference/types/number):
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* addition: `1 + 3`
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* subtraction: `1 - 3 `
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* multiplication: `3 * 2`
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* integer division: `7 / 3`
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* modulo is available through the [math library](/blocks/math)
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### Relational operators
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The following relational operators work on numbers and return a [Boolean](/blocks/logic/boolean):
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* equality: `(3 + 1) = 4`
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* inequality: `3 != 4`
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* less or equal than: `3 <= 4`
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* less than: `3 < 4`
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* greater or equal than : `4 >= 3`
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* greater than: `4 > 3`
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### Show number
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The [show number](/reference/basic/show-number) function displays a number on the [LED screen](/device/screen).
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For example, this code displays the number 42:
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```blocks
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basic.showNumber(42);
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```
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### Functions that return a number
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Some functions return a number, which you can store in a variable.
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For example the following code gets the display brightness
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(using the [brightness function](/reference/led/brightness)) and stores the value in a variable named `brightness`:
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```blocks
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let brightness = led.brightness()
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```
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### Math functions
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The [math library](/blocks/math) includes math related functions.
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For example, the `absolute` function returns the returns the absolute value of input parameter `x`:
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```blocks
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let abs = Math.abs(-42);
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basic.showNumber(abs);
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```
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### See also
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[math](/blocks/math), [var](/blocks/variables/var), [Boolean](/blocks/logic/boolean), [show number](/reference/basic/show-number)
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