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My BASIC Notes

ASC()
Abbreviation: A <SHIFT+S>

TYPE: Function-Numeric
FORMAT: ASC(<string>)

Action: ASC will return a number from 0 to 255 which corresponds to the Commodore ASCII value of the first character in the string.

EXAMPLES OF ASC Function:

10 PRINT ASC("Z")
20 X = ASC("ZEBRA")
30 J = ASC(J$)

If there are no characters in the string, an ?ILLEGAL QUANTITY error results. In the third example above, if J$="", the ASC function will not work. The GET and GET# statement read a CHR$(0) as a null string. To eliminate this problem, you should add a CHR$(0) to the end of the string as shown below.

EXAMPLE of ASC Function Avoiding ILLEGAL QUANTITY ERROR:

30 J = ASC(J$ + CHR$(0))