Boolean values: Difference between revisions

=={{header|Batch File}}==

The closest thing to Boolean values in batch files is using <code>if defined</code>.

If a variable has any value, it will evaluate to true.

You can make a variable false by clearing its value <code>set "var="</code>.

<lang dos>

@echo off

::true

set "a=x"

::false

set "b="

if defined a (

echo a is true

) else (

echo a is false

)

if defined b (

echo b is true

) else (

echo b is false

)

pause>nul

</lang>

'''Output:'''

<pre>

a is true

b is false

</pre>