Java Program to Enter a Number in Digit and Display in Words

Digits are basically represented in number format or these are integer values. But for pronouncing them we are using words. Every digit has a unique word format.

For example, the word format of 1 is “One”. Like that for 2 the word format is “two”, for 3 the word format is “three” ... etc. For two-digit number the number format is little different. 21 represents as “twenty-one”, 45 represents as “forty-five” .... etc. So for all type of number there has a unique word format available.

To show you some instances 

Instance-1

Input number is 15.
Word format of 15 = Fifteen

Instance-2

Input number is 123.
Word format of 123 = One Hundred Twenty-Three

Instance-3

Input number is 4532.
Word format of 4532 = Four Thousand Five Hundred Thirty-Two.

Algorithm

Step-1 − Get the input number by static input method.

Step-2 − Declare an array of string type and store the number in string.

Step-3 − Then we are declaring some other string type of array in which we store the word format of different type of digits like one digit number, two-digit number, hundred place and thousand place (Here we are only written code up to four-digit number which you can extend further as per your requirement).

Step-4 − We are finding the length of the given number. According to the length of the number, we have different conditions to concatenate the array’s index value.

Step-5 − After completing the process we print that number along with its word format.

Approach

We have provided the solution in different approaches.

• By User Defined Method with Static Input Values.

Let’s see the program along with its output one by one.

Approach − By Using User Defined Method with Static Input Value

In this approach, we declare some random input numbers by static input and pass these numbers as parameters in a user defined method, then inside the method by using the algorithm we can print the word format of given number.

Example

public class Main{
   public static void main(String args[]) {
      digitToWord("1234".toCharArray());
      digitToWord("557".toCharArray());
      digitToWord("45".toCharArray());
      digitToWord("2".toCharArray());
      digitToWord("0".toCharArray());
      digitToWord("801".toCharArray());
      digitToWord("54312".toCharArray());
      //passing empty string
      digitToWord("".toCharArray());
   }
   static void digitToWord(char n[]) {
      int len = n.length;
      if (len == 0) {
         System.out.println("Empty string.");
         return;
      }
      if (len > 4) {
         System.out.print(String.valueOf(n) + ": ");
         System.out.println("The number you have entered has more than four digits.");
         return;
      }
      String[] unitPlaceDig = new String[] {"Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
      String[] tensPlaceDig = new String[] {"", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"}; 
      String[] tensMultiplier = new String[] {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
      String[] powOfTens = new String[] {"Hundred", "Thousand"};
      System.out.print(String.valueOf(n) + ": ");
      if (len == 1){
         System.out.println(unitPlaceDig[n[0]-'0']);
         return;
      }
      int p = 0;
      while (p < n.length) {
         if (len >= 3){
            if (n[p] - '0' != 0) {
               System.out.print(unitPlaceDig[n[p] - '0'] + " ");
               System.out.print(powOfTens[len - 3]+ " ");
            }
            --len;
         }
         else {
            if (n[p] - '0' == 1) {
               int sum = n[p] - '0' + n[p + 1] - '0';
               System.out.println(tensPlaceDig[sum]);
               return;
            }
            else if (n[p] - '0' == 2 && n[p + 1] - '0' == 0) {
               System.out.println("Twenty");
               return;
            }
            else {
               int i = (n[p] - '0');
               if (i > 0)
               System.out.print(tensMultiplier[i]+ " ");
               else
               System.out.print("");
               ++p;
               if (n[p] - '0' != 0)
               System.out.println(unitPlaceDig[n[p] - '0']);
            } 
         }
         ++p;
      }
   }
}

Output

1234: One Thousand Two Hundred Thirty Four
557: Five Hundred Fifty Seven
45: Forty Five
2: Two
0: Zero
801: Eight Hundred One
54312: The number you have entered has more than four digits.
Empty string.

In this article, we explored how to take input of a number and display the number in words in Java.