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Null object: Difference between revisions
→{{header|AWK}}
Line 88:
<lang AutoHotkey>If (object == null)
MsgBox, object is null</lang>
=={{header|AWK}}==
Undefined elements correspond to an empty string; when converted to a numerical value, it evaluates to 0. In order to distinguish a undefined value from a value of 0, length(var) need to be used.
<lang AWK>#!/usr/bin/awk -f
BEGIN {
b=0;
print "<"b,length(b)">"
print "<"u,length(u)">"
print "<"u+0,length(u+0)">";
}</lang>
Output
<pre><0 1>
< 0>
<0 1></pre>
=={{header|Babel}}==
| |||