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Empty string: Difference between revisions
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</lang>
=={{header|Component Pascal}}==
BlackBox Component Builder
<lang oberon2>
MODULE EmptyString;
IMPORT StdLog;
PROCEDURE Do*;
VAR
s: ARRAY 64 OF CHAR;
(* s := "" <=> s[0] := 0X => s isEmpty*)
BEGIN
s := "";
StdLog.String("Is 's' empty?:> ");StdLog.Bool(s = "");StdLog.Ln;
StdLog.String("Is not 's' empty?:> ");StdLog.Bool(s # "");StdLog.Ln;
StdLog.Ln;
(* Or *)
s := 0X;
StdLog.String("Is 's' empty?:> ");StdLog.Bool(s = 0X);StdLog.Ln;
StdLog.String("Is not 's' empty?:> ");StdLog.Bool(s # 0X);StdLog.Ln;
StdLog.Ln;
END Do;
END EmptyString.
</lang>
Execute: ^Q EmptyString.Do<br/>
Output:
<pre>
Is 's' empty?:> $TRUE
Is not 's' empty?:> $FALSE
Is 's' empty?:> $TRUE
Is not 's' empty?:> $FALSE
</pre>
=={{header|D}}==
D treats null strings and empty strings as equal on the value level, but different on object level. You need to take this into account when checking for emptiness.
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