Undefined values: Difference between revisions

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@@ Line 866: / Line 866: @@
 =={{header|REXX}}==
+<lang rexx>/*REXX program to test if a variable is defined. */
-<lang rexx>
-/*REXX program to test if a variable is defined. */
 tlaloc = "rain god of the Aztecs."
@@ Line 889: / Line 888: @@
 y='tlaloc'
 if symbol(y)=="VAR" then say y 'is defined.'
-                    else say y "ain't defined."
+                    else say y "ain't defined."</lang>
+'''output'''
-</lang>
+<pre style="overflow:scroll">
-Output:
-<pre style="height:30ex;overflow:scroll">
 tlaloc is defined.
 xiuhtecuhtli ain't defined.