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- ( returns negative value on error )
- : _ ( c -- n )
- ( '0' is ASCII 48 )
- 48 -
- DUP 0< IF EXIT THEN ( bad )
- DUP 10 < IF EXIT THEN ( good )
- ( 'a' is ASCII 97. 59 = 97 - 48 )
- 49 -
- DUP 0< IF EXIT THEN ( bad )
- DUP 6 < IF 10 + EXIT THEN ( good )
- ( bad )
- 255 -
- ;
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