Boolean

Programming basics

In most computer programming languages, a Boolean data type is a data type with only two possible values: true or false.

By convention we can express true as the integer 1 and false as the integer 0 (zero). Please be careful as some programming languages treat an empty or unset value as FALSE.

Example

In PHP:

<?php
$myFirstVar = True; // assign the value TRUE to $myFirstVar
$myOtherVar = False; // assign the value FALSE to $myOtherVar
?>

In Python:

myFirstVar = True
myOtherVar = False

In Javascript:

var myFirstVar = true;
var myOtherVar = false;

Standards

• Define the terms: variable, constant, operator, object.

A natural number, a negative of a natural number, or zero.

Give the precise meaning of a word, phrase, concept or physical quantity.