From: dxforth@gmail.com   
      
   On 30/10/2024 12:45 am, Hans Bezemer wrote:   
   > On 29-10-2024 10:25, dxf wrote:   
   >> On 29/10/2024 4:07 am, Hans Bezemer wrote:   
   >>> ...   
   >>> I have put the complication elsewhere. If we assume we're working in   
   decimal, you don't even need >NUMBER:   
   >>>   
   >>> char 0 negate +constant 0-   
   >>>   
   >>> : /int    ( a1 n1 -- a2 n2 n3)   
   >>>    0 >r 1 >r 1- chars over +   
   >>>    begin   
   >>>     over 1- over <   
   >>>    while   
   >>>      dup c@ is-digit   
   >>>    while   
   >>>      dup c@ 0- r> tuck * r> + >r 10 * >r 1-   
   >>>    repeat over - rdrop r> -rot   
   >>> ;   
   >>> ...   
   >>   
   >> So that's how to convert a numeric string from the other end.   
   >> Nice!  Easier than I imagined it would be.   
   >   
   > TORS is the multiplier, 2ORS is the accumulator. Normally, the multiplier is   
   multiplied after each run with BASE @ - but that makes little sense when   
   IS-DIGIT isn't properly adjusted. Would be a nice exercise, though.   
      
   Something like this...   
      
   \  \CHAR ( a u -- a u-1 c )   
   \  >DIGIT ( c base -- u -1 | c 0 )   
      
   : /INT ( a1 n1 -- a2 n2 u )   
     0 >r  1  begin  >r  dup while   
       \char  base @ >digit  while   
       r> tuck  *  r> + >r  base @ *   
     repeat  drop ( -1 /string)  then  rdrop  r> ;   
      
   OTOH the necessity to convert R-L is probably rare.   
      
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