ASC (statement) - mkilgore/QB64pe GitHub Wiki

The ASC statement allows a QB64 program to change a character at any position of a STRING variable.

ASC(stringExpression$[,]) = code%

• The stringExpression$ variable's value must have been previously defined and cannot be an empty string ("").
• position% is optional. If no position is used, the leftmost character at position 1 is assumed.
• position% cannot be zero or greater than the string's length or an Illegal function error will occur.
• The ASCII replacement code% value can be any INTEGER value from 0 to 255.
• Some ASCII control characters will not PRINT a character or may format the SCREEN. _PRINTSTRING can print them graphically.

Example: Demonstrates how to change existing text characters one letter at a time.

 a$ = "YZC"
 ASC (statement)(a$) = 65                 ' CHR$(65) = "A"
 ASC (statement)(a$, 2) = 66              ' CHR$(66) = "B"
 PRINT a$ 'ABC

 ASC (statement)(a$, 2) = 0               ' CHR$(0) = " " 
 PRINT a$

 ASC (statement)(a$, 2) = ASC("S")        ' get code value from ASC function
 PRINT a$

 ABC
 A C
 ASC

• ASC (function)
• MID$ (statement)
• _PRINTSTRING
• INKEY$, ASCII