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  1. import java.io.*;
  2. import java.util.*;
  3.  
  4. class Ideone
  5. {
  6. 	/**
  7. 	Convert decimal number lying between 1-3999 to roman numerals
  8.  
  9. 	SYMBOL       VALUE
  10. 	I             1
  11. 	II			  2
  12. 	III			  3
  13. 	IV            4
  14. 	V             5
  15. 	X             10
  16. 	L             50
  17. 	C             100
  18. 	D             500
  19. 	M             1000     
  20.  
  21. 	299 - CCXCIX
  22.  
  23.  
  24. 	**/
  25. 	private static String roman(int n) {
  26. 		HashMap<Integer, String> mp = new HashMap<>();
  27. 		mp.put(1, "I");
  28. 		mp.put(2, "II");
  29. 		mp.put(3, "III");
  30. 		mp.put(4, "IV");
  31. 		mp.put(5, "V");
  32. 		mp.put(9, "IX");
  33. 		mp.put(10, "X");
  34. 		mp.put(40, "XL");
  35. 		mp.put(50, "L");
  36. 		mp.put(90, "XC");
  37. 		mp.put(100, "C");
  38. 		mp.put(400, "CD");
  39. 		mp.put(500, "D");
  40. 		mp.put(900, "CM");
  41. 		mp.put(1000, "M");
  42.  
  43. 		int[] val = new int[]{1000,900, 500,400, 100,90, 50,40, 10,9 , 5, 4, 3, 2, 1};
  44.  
  45. 		StringBuilder sb = new StringBuilder();
  46. 		for(int i=0;i<val.length;i++) {
  47. 			while(n>=val[i]) {
  48. 				n-=val[i];
  49. 				sb.append(mp.get(val[i]));
  50. 			}
  51. 		}
  52.  
  53. 		return sb.toString();
  54. 	}
  55.  
  56. 	public static void main(String[] args) throws java.lang.Exception
  57. 	{
  58. 		Scanner in = new Scanner(System.in);
  59.     	int n = in.nextInt();
  60. 		System.out.println(roman(n));
  61. 	}
  62. }
Success #stdin #stdout 0.14s 54600KB
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CMLXXXIX
https://ideone.com/qWeXn2
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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