Languages :: PHP :: roman numerals |
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By: roe1and  |
Date: 06/11/2007 15:29:59  |
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 | |
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". |
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| By: roe1and | Date: 06/11/2007 19:51:11 | |
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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