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47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
The [[MID$]] statement substitutes one or more new characters for existing characters of a previously defined [[STRING]].
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{{PageSyntax}}
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: [[MID$]]({{Parameter|baseString$}}, {{Parameter|startPosition%}}[, {{Parameter|bytes%}}]) = {{Parameter|replacementString$}}
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{{PageDescription}}
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* The {{Parameter|baseString$}} variable must exist and be large enough to contain the {{Parameter|replacementString$}}.
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* {{Parameter|startPosition%}} specifies the string character position to start the overwrite.
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* {{Parameter|bytes%}} or number of characters is optional. Excess byte lenghts are ignored.
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* The {{Parameter|replacementString$}} should be as long as the byte length reserved.
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* The length of the original string is not changed in any case. If {{Parameter|replacementString$}} is longer, it gets clipped.
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{{PageExamples}}
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''Example:'' Using [[INSTR]] to locate the string positions and a [[MID$ (statement)|MID$]] statement to change the words.
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{{CodeStart}}
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text$ = "The cats and dogs were playing, even though dogs don't like cats."
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{{Cl|PRINT}} text$
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start% = 1 ' start cannot be 0 when used in the INSTR function!
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{{Cl|DO...LOOP|DO}}
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position% = {{Cl|INSTR}}(start%, text$, "dog")
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{{Cl|IF}} position% {{Cl|THEN}} ' when position is a value greater than 0
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{{Cl|MID$}}(text$, position%, 3) = "rat" ' change "dog" to "rat" when found
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start% = position% + 1 ' advance one position to search rest of string
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{{Cl|END IF}}
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{{Cl|LOOP}} {{Cl|UNTIL}} position% = 0 ' no other matches found
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{{Cl|PRINT}} text$ '' ''
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{{CodeEnd}}
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{{OutputStart}}
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The cats and dogs were playing, even though dogs don't like cats.
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The cats and rats were playing, even though rats don't like cats.
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{{OutputEnd}}
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{{PageSeeAlso}}
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* [[MID$]] {{text|(function)}}
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* [[LEFT$]], [[RIGHT$]]
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* [[INSTR]], [[ASCII]], [[STR$]], [[HEX$]], [[Bitmaps]] (example)
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* [[MKI$]], [[MKL$]], [[MKS$]], [[MKD$]]
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{{PageNavigation}}
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