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→{{header|REXX}}: added whitespace to the REXX section comments, made other cosmetic changes (for highlighting).
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=={{header|REXX}}==
REXX can have variables with a null value.
<br>With the '''symbol''' built-in function, it can be determined if a variable is defined (or not).
<br>The '''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''' value has a length of '''0''' (zero).
<br><br>The '''
<lang rexx>/*REXX program demonstrates null strings, and also undefined values. */
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