Null object: Difference between revisions

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→‎{{header|REXX}}: used boldfaced font for functions in the comment part of the section header. -- ~~~~

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Revision as of 11:59, 26 September 2012 (view source) rosettacode>Cardinal m ([Erlang] Improve readability.) ← Older edit		Revision as of 21:38, 18 October 2012 (view source) rosettacode>Gerard Schildberger m (→‎{{header\|REXX}}: used boldfaced font for functions in the comment part of the section header. -- ~~~~) Newer edit →
Line 795: =={{header\|REXX}}== REXX can have variables with a null value. <br>With the ~~SYMBOL~~'''symbol''' built-in function, it can be determined if a variable is defined (or not). <br>The ~~LENGTH~~'''length''' built-in function can be used to see what the length of the value of a defined variable. <br>A variable with a ~~NULL~~'''null''' value has a length of 0 (zero). <br><br>The '''DROP''' statement can be used to "un-define" a REXX variable. <lang rexx>/REXX program demonstrates null strings, and also undefined values. /