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48 lines
1.3 KiB
Markdown
48 lines
1.3 KiB
Markdown
The [ASC (statement)](ASC-(statement)) statement allows a **QB64** program to change a character at any position of a [STRING](STRING) variable.
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## Syntax
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> [ASC (statement)](ASC-(statement))(stringExpression$[, position%]) = code%
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## Description
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* The stringExpression$ variable's value must have been previously defined and cannot be an empty string ("").
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* position% is optional. If no position is used, the leftmost character at position 1 is assumed.
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* position% cannot be zero or greater than the string's [LEN](LEN) or an [ERROR Codes](ERROR-Codes) will occur.
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* The [ASCII](ASCII) replacement code% value can be any [INTEGER](INTEGER) value from 0 to 255.
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* Some [ASCII](ASCII) control characters will not [PRINT](PRINT) a character or may format the [SCREEN](SCREEN). [_PRINTSTRING](_PRINTSTRING) can print them graphically.
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## Example(s)
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Demonstrates how to change existing text characters one letter at a time.
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```vb
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a$ = "YZC"
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ASC(a$) = 65 ' CHR$(65) = "A"
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ASC(a$, 2) = 66 ' CHR$(66) = "B"
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PRINT a$ 'ABC
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ASC(a$, 2) = 0 ' CHR$(0) = " "
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PRINT a$
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ASC(a$, 2) = ASC("S") ' get code value from ASC function
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PRINT a$
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```
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```text
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ABC
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A C
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ASC
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```
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## See Also
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* [ASC](ASC) (function)
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* [MID$ (statement)](MID$-(statement))
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* [_PRINTSTRING](_PRINTSTRING)
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* [INKEY$](INKEY$), [ASCII](ASCII)
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