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47 lines
1.5 KiB
Plaintext
47 lines
1.5 KiB
Plaintext
The [[ASC (statement)|ASC]] statement allows a '''QB64''' program to change a character at any position of a [[STRING]] variable.
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{{PageSyntax}}
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: [[ASC (statement)|ASC]]({{Parameter|stringExpression$}}[, {{Parameter|position%}}]) = {{Parameter|code%}}
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{{PageDescription}}
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* The {{Parameter|stringExpression$}} variable's value must have been previously defined and cannot be an empty string ("").
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* {{Parameter|position%}} is optional. If no position is used, the leftmost character at position 1 is assumed.
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* {{Parameter|position%}} cannot be zero or greater than the string's [[LEN|length]] or an [[ERROR Codes|Illegal function error]] will occur.
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* The [[ASCII]] replacement {{Parameter|code%}} value can be any [[INTEGER]] value from 0 to 255.
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* Some [[ASCII]] control characters will not [[PRINT]] a character or may format the [[SCREEN]]. [[_PRINTSTRING]] can print them graphically.
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{{PageExamples}}
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''Example:'' Demonstrates how to change existing text characters one letter at a time.
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{{CodeStart}}
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a$ = "YZC"
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{{Cl|ASC (statement)|ASC}}(a$) = 65 ' CHR$(65) = "A"
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{{Cl|ASC (statement)|ASC}}(a$, 2) = 66 ' CHR$(66) = "B"
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{{Cl|PRINT}} a$ 'ABC
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{{Cl|ASC (statement)|ASC}}(a$, 2) = 0 ' CHR$(0) = " "
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{{Cl|PRINT}} a$
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{{Cl|ASC (statement)|ASC}}(a$, 2) = {{Cl|ASC}}("S") ' get code value from ASC function
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{{Cl|PRINT}} a$
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{{CodeEnd}}
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{{OutputStart}}
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ABC
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A C
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ASC
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{{OutputEnd}}
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{{PageSeeAlso}}
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* [[ASC]] {{text|(function)}}
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* [[MID$ (statement)]]
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* [[_PRINTSTRING]]
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* [[INKEY$]], [[ASCII]]
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{{PageNavigation}}
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