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  1. using System;
  2. using System.Linq;
  3.  
  4. public class RomanNumeral
  5. {
  6.     const int NaN = -1;
  7.     private static int ToInteger(string roman_numeral) {
  8.         string ro_num = roman_numeral.ToUpper().Trim();
  9.         char[]  ro_num_array = ro_num.ToCharArray();
  10.         if (ro_num == "N") { return 0; }
  11.  
  12.         char[] symbols = { 'I', 'V', 'X', 'L', 'C', 'D', 'M' };
  13.         int [] values = { 1, 5, 10, 50, 100, 500, 1000 };
  14.         int int_num = 0;
  15.         int symb_it = 0, symb_consec = 0;
  16.  
  17.         bool to_parse = true;
  18.         int subtrahend = 0, didgit = -1;
  19.         foreach (char ro_num_char in ro_num_array.Reverse<char>()) {
  20.             Console.WriteLine(ro_num_char);
  21.             do
  22.             {
  23.                 if (ro_num_char == symbols[symb_it])
  24.                 {
  25.                     symb_consec += (symb_it%2==1)? 3:1;
  26.                     if (symb_consec > 3) {
  27.                         Console.WriteLine("symb_consec>3");return NaN; 
  28.                     }
  29.                     didgit = symb_it/2*2+2;
  30.                     Console.WriteLine("Didgit: " + didgit);
  31.  
  32.                     subtrahend = ((symb_it-1)/2)*2;
  33.                     int_num += values[symb_it];
  34.                     to_parse = false;
  35.                     Console.WriteLine(values[symb_it]);
  36.                 } 
  37.                 else if ((ro_num_char == symbols[subtrahend]))
  38.                 {
  39.                     if (didgit == symb_it) { return NaN; }
  40.                     didgit = symb_it;
  41.  
  42.                     int_num -= values[subtrahend];
  43.                     to_parse = false;
  44.                     //Console.WriteLine(over_six);
  45.                 }
  46.                 if (to_parse) {
  47.                     symb_it++;
  48.                     if (symb_it > 6) { Console.WriteLine("symb_it>6");return NaN; }
  49.                     symb_consec = 0;
  50.                 }
  51.             } while (to_parse);
  52.  
  53.             to_parse = true;
  54.         }
  55.         return int_num;
  56.     }
  57.     public static void Main()
  58.     {
  59.         int test = RomanNumeral.ToInteger("MMCMXCIV");
  60.         Console.WriteLine(String.Format("{0:D0}",test));
  61.     }
  62. }
Success #stdin #stdout 0.05s 24040KB
comments ()
stdin
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Standard input is empty
stdout
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V
Didgit: 2
5
I
C
Didgit: 6
100
X
M
Didgit: 8
1000
C
M
Didgit: 8
1000
M
Didgit: 8
1000
2994
https://ideone.com/kbMiUI
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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