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7 lines
178 B
Plaintext
7 lines
178 B
Plaintext
( returns negative value on error )
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: _ ( c -- n )
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DUP '0' '9' =><= IF '0' - EXIT THEN
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DUP 'a' 'f' =><= IF 0x57 ( 'a' - 10 ) - EXIT THEN
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DROP -1 ( bad )
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;
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