Programming Tutorials

Converting a number into its equalant value in words in Java

By: Ganesh Iyer  

In this tutorial, i will explain how a number can be converted to its value as a word using Java. If you are wondering how and where this can be used, take the example of Money values. If the Amount is in numbers and you would like to convert the amount in words then this program will be useful for you.

/* Author         - Ganesh Iyer
  Program        - Displaying the input number into words
  Written on     - 06-06-2009 */


class constNumtoLetter
  {
      String[] unitdo ={"", " One", " Two", " Three", " Four", " Five",
         " Six", " Seven", " Eight", " Nine", " Ten", " Eleven", " Twelve",
         " Thirteen", " Fourteen", " Fifteen",  " Sixteen", " Seventeen", 
         " Eighteen", " Nineteen"};
      String[] tens =  {"", "Ten", " Twenty", " Thirty", " Forty", " Fifty",
         " Sixty", " Seventy", " Eighty"," Ninety"};
      String[] digit = {"", " Hundred", " Thousand", " Lakh", " Crore"};
     int r;


      //Count the number of digits in the input number
      int numberCount(int num)
      {
          int cnt=0;

          while (num>0)
          {
            r = num%10;
            cnt++;
            num = num / 10;
          }

            return cnt;
      }


      //Function for Conversion of two digit

      String twonum(int numq)
      {
           int numr, nq;
           String ltr=\"";

           nq = numq / 10;
           numr = numq % 10;

           if (numq>19)
             {
           ltr=ltr+tens[nq]+unitdo[numr];
             }
           else
             {
           ltr = ltr+unitdo[numq];
             }

           return ltr;
      }

      //Function for Conversion of three digit

      String threenum(int numq)
      {
             int numr, nq;
             String ltr = "";

             nq = numq / 100;
             numr = numq % 100;

             if (numr == 0)
              {
              ltr = ltr + unitdo[nq]+digit[1];
               }
             else
              {
              ltr = ltr +unitdo[nq]+digit[1]+" and"+twonum(numr);
              }
             return ltr;

      }

}

 class originalNumToLetter

   {

      public static void main(String[] args) throws Exception
      {

          //Defining variables q is quotient, r is remainder

          int len, q=0, r=0;
          String ltr = " ";
          String Str = "Rupees";
          constNumtoLetter n = new constNumtoLetter();
          int num = Integer.parseInt(args[0]);

          if (num <= 0) System.out.println(\"Zero or Negative number not for conversion");

          while (num>0)
          {

             len = n.numberCount(num);

             //Take the length of the number and do letter conversion

             switch (len)

             {
                  case 8:
                          q=num/10000000;
                          r=num%10000000;
                          ltr = n.twonum(q);
                          Str = Str+ltr+n.digit[4];
                          num = r;
                          break;

                  case 7:
                  case 6:
                          q=num/100000;
                          r=num%100000;
                          ltr = n.twonum(q);
                          Str = Str+ltr+n.digit[3];
                          num = r;
                          break;

                  case 5:
                  case 4:

                           q=num/1000;
                           r=num%1000;
                           ltr = n.twonum(q);
                           Str= Str+ltr+n.digit[2];
                           num = r;
                           break;

                  case 3:


                            if (len == 3)
                                r = num;
                            ltr = n.threenum(r);
                            Str = Str + ltr;
                            num = 0;
                            break;

                  case 2:

                           ltr = n.twonum(num);
                           Str = Str + ltr;
                           num=0;
                           break;

                  case 1:
                           Str = Str + n.unitdo[num];
                           num=0;
                           break;
                  default:

                          num=0;
                          System.out.println(\"Exceeding Crore....No conversion");
                          System.exit(1);


              }
                          if (num==0)
                          System.out.println(Str+\" Only");
            }

         }

      }

      To Execute

                 java originalNumToLetter <INPUT>

             Ex -   java originalNumToLetter 1234

      Output


      Rupees One Thousand Two Hundred and Thirty Four Only

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