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Undefined values: Difference between revisions

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Undefined values (view source)

Revision as of 22:59, 11 September 2015

311 bytes added ,  8 years ago
m
→‎{{header|REXX}}: used gooder Unglish, added/changed whitespace and comments.
m (→‎{{header|REXX}}: used gooder Unglish, added/changed whitespace and comments.)
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=={{header|REXX}}==
<lang rexx>/*REXX program to test if a (REXX) variable is defined or not defined. */
tlaloc = "rain god of the Aztecs." /*assign a value to the Aztec rain god.*/▼
/*check if the rain god is defined. */▼
y= 'tlaloc'▼
if symbol(y)=="VAR" then say y ' is defined.'▼
else say y "ainisn't defined."▼
 
/*check if the rain fire god is defined. */▼
▲tlaloc = "rain god of the Aztecs."
 
y= 'xiuhtecuhtli' /*assign a value to the Aztec file god.*/
if symbol(y)=="VAR" then say y ' is defined.'▼
else say y "ainisn't defined."</lang>▼
 
▲ /*check if the rain god is defined.*/
▲y='tlaloc'
▲if symbol(y)=="VAR" then say y 'is defined.'
▲ else say y "ain't defined."
 
drop tlaloc /*un-defineun─define the TLALOC REXX variable. */▼
 
/*check if the fire rain god is defined. */
y= 'tlaloc'▼
 
if symbol(y)=="VAR" then say y ' is defined.'
y='xiuhtecuhtli'
if symbol(y)=="VAR" then else say y "isn'ist defined.'"
else say y "ain /*stick a fork in it, we'tre definedall done." */</lang>
 
 
▲drop tlaloc /*un-define the TLALOC variable. */
▲ /*check if the rain god is defined.*/
▲y='tlaloc'
▲if symbol(y)=="VAR" then say y 'is defined.'
▲ else say y "ain't defined."</lang>
'''output'''
<pre>
<pre style="overflow:scroll">
tlaloc is defined.
xiuhtecuhtli ainisn't defined.
tlaloc ainisn't defined.
</pre>
 
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