Empty string: Difference between revisions
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m (→{{header|Avail}}: replaced </avail> with </lang>) |
(Empty string in various BASIC dialents (BASIC256, True BASIC, QBasic and Yabasic)) |
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There are other ways, such as a zero return from the <tt>LEN(s$)</tt> or <tt>ULEN(utf$)</tt> functions. <tt>EQUAL(s$, "")</tt> would be another way. |
There are other ways, such as a zero return from the <tt>LEN(s$)</tt> or <tt>ULEN(utf$)</tt> functions. <tt>EQUAL(s$, "")</tt> would be another way. |
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==={{header|BASIC256}}=== |
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<lang basic256>subroutine IsEmpty (s$) |
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if length(s$) = 0 then |
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print "String is empty" |
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else |
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print "String is not empty" |
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end if |
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if s$ = "" then print "yes, the string is empty" |
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if s$ <> "" then print "no, the string is not empty" |
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end subroutine |
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t$ = "" |
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call IsEmpty (t$) |
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u$ = "not empty" |
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call IsEmpty (u$) |
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end</lang> |
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==={{header|IS-BASIC}}=== |
==={{header|IS-BASIC}}=== |
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If a$ <> "" Then Print a$ 'String is not empty, so print its contents.</lang> |
If a$ <> "" Then Print a$ 'String is not empty, so print its contents.</lang> |
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=={{header| |
==={{header|QBasic}}=== |
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<lang QBasic>SUB IsEmpty (s AS STRING) |
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IF LEN(s) = 0 THEN |
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PRINT "String is empty" |
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ELSE |
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PRINT "String is not empty" |
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END IF |
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IF s = "" THEN PRINT "yes, the string is empty" |
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IF s <> "" THEN PRINT "no, the string is not empty" |
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END SUB |
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DIM s AS STRING ' implicitly assigned an empty string |
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IsEmpty (s) |
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t$ = "" ' explicitly assigned an empty string |
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IsEmpty (t$) |
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u$ = "not empty" |
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IsEmpty (u$)</lang> |
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==={{header|True BASIC}}=== |
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<lang qbasic>SUB IsEmpty(s$) |
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IF Len(s$) = 0 THEN |
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PRINT "String is empty" |
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ELSE |
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PRINT "String is not empty" |
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END IF |
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IF s$ = "" THEN PRINT "yes, the string is empty" |
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IF s$ <> "" THEN PRINT "no, the string is not empty" |
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END SUB |
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LET t$ = "" |
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CALL IsEmpty(t$) |
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LET u$ = "not empty" |
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CALL IsEmpty(u$) |
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END</lang> |
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==={{header|Yabasic}}=== |
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<lang yabasic>sub IsEmpty (s$) |
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if len(s$) = 0 then |
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print "String is empty" |
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else |
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print "String is not empty" |
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endif |
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if s$ = "" print "yes, the string is empty" |
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if s$ <> "" print "no, the string is not empty" |
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end sub |
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t$ = "" |
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IsEmpty (t$) |
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u$ = "not empty" |
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IsEmpty (u$) |
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end</lang> |
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=={{header|Batch File}}== |
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<lang dos> |
<lang dos> |
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@echo off |
@echo off |
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