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Undefined values: Difference between revisions
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=={{header|REXX}}==
<lang rexx>/*REXX program to test if a variable is defined. */▼
▲/*REXX program to test if a variable is defined. */
tlaloc = "rain god of the Aztecs."
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y='tlaloc'
if symbol(y)=="VAR" then say y 'is defined.'
else say y "ain't defined."</lang>
'''output'''
▲<pre style="height:30ex;overflow:scroll">
tlaloc is defined.
xiuhtecuhtli ain't defined.
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