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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
45 lines
1.9 KiB
Plaintext
45 lines
1.9 KiB
Plaintext
The '''MID$''' statement substitutes one or more new characters for existing characters of a previously defined [[STRING]].
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{{PageSyntax}}
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:: MID$(''basestring$'', ''start_position%''[, ''bytes%'']) = string_to_add$
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* The ''basestring'' variable [[STRING]] value must exist and be large enough to contain the ''string_to_add''.
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* ''Start position'' specifies the string character position to start the overwrite. Cannot be 0 or an [[ERROR Codes|Illegal function call error]] will occur!
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* The ''byte length'' or number of characters is optional. Excess statement string characters or byte lenghts are ignored.
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* The string value to be placed in the string 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! Excess characters will not be in the string value returned.
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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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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$, "dog")
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IF position% THEN ' when position is a value greater than 0
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{{Cl|MID$}}(text$, position%, 3) = "rat" ' changes "dog" to "rat" when found
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start% = position% + 1 ' advance one position to search rest of string
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END IF
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LOOP UNTIL position% = 0 ' no other matches found
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PRINT text$ '' ''
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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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''See also:''
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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}} |