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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12.  
  13.         System.out.println(roman2Decimal("XXIV"));
  14.  
  15.  
  16.         System.out.println(roman2Decimal("XXIX"));
  17. 	}
  18.  
  19.  
  20.     public static int roman2Decimal(String roman){
  21.         if (roman.length() == 0)
  22.             return 0;
  23.         int integerValue = 0;
  24.         int prevNumber = letterToNumber(roman.charAt(0));
  25.         for (int i = 1; i < roman.length(); i++) {
  26.             char ch = roman.charAt(i);
  27.             int number = letterToNumber(ch);
  28.             if (number >= prevNumber)
  29.                 integerValue += prevNumber;
  30.             else
  31.                 integerValue -= prevNumber;
  32.             prevNumber = number;
  33.         }
  34.         integerValue += prevNumber;
  35.         return integerValue;
  36.     }
  37.  
  38.  
  39.     private static int letterToNumber(char letter){
  40.         switch (letter) {
  41.             case 'I':  return 1;
  42.             case 'V':  return 5;
  43.             case 'X':  return 10;
  44.             case 'L':  return 50;
  45.             case 'C':  return 100;
  46.             case 'D':  return 500;
  47.             case 'M':  return 1000;
  48.             default:   return -1;
  49.         }
  50.     }
  51. }
Success #stdin #stdout 0.09s 27716KB
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https://ideone.com/2hCFH2
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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