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Languages :: PHP :: roman numerals
By: roe1and Great Britain  Date: 06/11/2007 15:29:59  English  Points: 20 Status: Answered
Quality : Excellent
i fixed this using a bucket load of if statements(if ($e = "i")$e = 1;if ($e = "ii")$e = 2;, etc)and even though i'm asking this question, i'm not really expecting an answer. is there a relatively simple way of changing roman numerals into arabic using php?
By: VGR Date: 06/11/2007 19:36:03 English  Type : Answer
yes and no.
No because I can't get out the code ready for use from my head ;-)
and yes because the reverse is a lot more complicated and is a classical IT/Maths class problem (at least, it was when I was in class ;-)

if you're not too in a hurry, I can try to retrieve some algorithm of mine : I've to dig into 30 years of archive, so be patient ;-)

if you're in a hurry, I would say from memory that a Roman number, say MCXL, can be transformed in an Hindic number (²) by simply moving from left to right by adding letter values ***in descending order*** and by changing the sign of the last intermediary summation when a sign of greater value arises. Exemple : CXL : 100 ; +10=110 ; 50 encountered : 10 was in fact -10 ; 100-10+50=140 CQFD
(you may substract 2*last_value from the intermediary sum IMHO)


(²) no arab influence in there, only transportation of the knowledge from the Persians, themselves from India etc ; Arabs themselves call those signs "hindis numbers".
By: roe1and Date: 06/11/2007 19:51:11 English  Type : Comment
please don't go to that much trouble. i was only asking out of curiosity. my script only needs to go to 20 or so so my if statements works ok. thanks for your help though.

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