Empty string: Difference between revisions
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if length(s) = 0 then ... /* To test whether a string is empty */ |
if length(s) = 0 then ... /* To test whether a string is empty */ |
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if length(s) > 0 then ... /* to test for a non-empty string */ |
if length(s) > 0 then ... /* to test for a non-empty string */ |
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</lang> |
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=={{header|Prolog}}== |
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{{works with|SWI-Prolog|7}} |
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<lang prolog>assign_empty_string(Variable) :- Variable = "". |
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is_empty_string(String) :- String == "". |
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not_empty_string(String) :- String \== "". |
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</lang> |
</lang> |
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