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September 2017 Update

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Ingy döt Net 2017-09-23 10:01:46 +02:00
parent bba7bfd280
commit ba8067c3b7
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Task/Parsing-RPN-calculator-algorithm/OoRexx/parsing-rpn-calculator-algorithm.rexx Normal file
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/* ooRexx *************************************************************
* 10.11.2012 Walter Pachl translated from PL/I via REXX
**********************************************************************/
fid='rpl.txt'
ex=linein(fid)
Say 'Input:' ex
/* ex=' 3 4 2 * 1 5 - 2 3 ^ ^ / +' */
Numeric Digits 15
expr=''
st=.circularqueue~new(100)
Say 'Stack contents:'
do While ex<>''
Parse Var ex ch +1 ex
expr=expr||ch;
if ch<>' ' then do
If pos(ch,'0123456789')>0 Then /* a digit goes onto stack */
st~push(ch)
Else Do /* an operator */
op=st~pull /* get top element */
select /* and modify the (now) top el*/
when ch='+' Then st~push(st~pull + op)
when ch='-' Then st~push(st~pull - op)
when ch='*' Then st~push(st~pull * op)
when ch='/' Then st~push(st~pull / op)
when ch='^' Then st~push(st~pull ** op)
end;
Say st~string(' ','L') /* show stack in LIFO order */
end
end
end
Say 'The reverse polish expression = 'expr
Say 'The evaluated expression = 'st~pull