Number conversions

Convert an roman integer in its decimal equivalent : http://tech-queries.blogspot.com/2010/03/convert-roman-integer-in-decimal.html


Convert IP Address From String To HexaDecimal : http://tech-queries.blogspot.com/2010/03/convert-ip-address-from-string-to-int.html

public static void convertToHexaDecimal(String s) {    
  StringTokenizer st = new StringTokenizer(s,".");
  System.out.print("0x");
  int i = Integer.parseInt(st.nextToken()); 
  System.out.print(Integer.toHexString(i));
  
  i = Integer.parseInt(st.nextToken());
  System.out.print(Integer.toHexString(i));
  
  i = Integer.parseInt(st.nextToken());
  System.out.print(Integer.toHexString(i));
  
  i = Integer.parseInt(st.nextToken());
  System.out.print(Integer.toHexString(i));
 }

The letters used in Roman numbers are:

• I = 1
• V = 5
• X = 10
• L = 50
• C = 100
• D = 500
• M = 1000

Convert Decimal number into roman number :

public class ConvertDecimalToRoman {

 public static void main(String[] args) {

  long num = 50;
  // convert decimal number into roman number
  StringBuilder roman = new StringBuilder("");

  long count = 0;

  if (num >= 1000) {
   count = num / 1000;
   while (count-- != 0)
    roman.append("M");
   num %= 1000;
  }

  if (num >= 500) {
   count = num / 500;
   while (count-- != 0)
    roman.append("D");
   num %= 500;
  }

  if (num >= 100) {
   count = num / 100;
   while (count-- != 0)
    roman.append("L");
   num %= 100;
  }

  if (num >= 50) {
   count = num / 50;
   while (count-- != 0)
    roman.append("L");
   num %= 50;
  }

  if (num >= 10) {
   count = num / 10;
   while (count-- != 0)
    roman.append("X");
   num %= 10;
  }

  if (num >= 5) {
   count = num / 5;
   while (count-- != 0)
    roman.append("V");
   num %= 5;
  }

  while (num != 0) {
   roman.append("I");
   num--;
  }
  System.out.println(roman);
 }
}