Null object: Difference between revisions
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=={{header|BASIC}}== |
=={{header|BASIC}}== |
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==={{header|Applesoft BASIC}}=== |
==={{header|Applesoft BASIC}}=== |
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t{} is null |
t{} is null |
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</pre> |
</pre> |
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==={{header|GWBASIC/QBasic/QB/VBDOS}}=== |
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These dialects of BASIC have no built-in object system. One STRING variable can have a default empty ("") value and a numeric one a default zero (0) value. A STRING variable can be assigned with the NULL (Chr$(0)) value if needed and can be assesed with the instruction. |
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<lang BASIC> |
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IF VAR$ = CHR$(0) THEN PRINT "Variable has a null value." |
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</lang> |
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=={{header|Bracmat}}== |
=={{header|Bracmat}}== |
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