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Java Program to Convert digitnumbers to words

Last Updated on July 4, 2023 by Mayank Dham

Converting numbers to words is a process of representing numerical values using their corresponding textual representation. For example, converting the number 123 to words would result in "one hundred twenty-three". This conversion is often required in applications involving financial transactions, generating reports, or displaying numbers in a more human-readable format.

The process of converting numbers to words involves breaking down the numerical value into smaller units such as ones, tens, hundreds, thousands, and so on. Each unit is then converted into its corresponding word representation using a set of predefined rules or lookup tables. These rules typically handle special cases, such as numbers between 10 and 19, which have unique word representations.

Algorithm to Convert digit numbers to words

The conversion algorithm involves iterating over the digits of the number, grouping them into units, and applying the conversion rules to generate the word representation. The algorithm should consider the position and magnitude of each digit within the number to determine the appropriate words to use.

The Algorithm steps are as follows:
Step 1: Take user input into consideration.
Step 2: If the digit is more than 999 or not, use two conditional If statements.
Step 3: If so, divide the number in half at the tens of thousands point.
Step 4: Now The show() method will output the three-digit number in its words format if you supply it as an input.


class Main {
    static void convert_to_words(char[] num)
        int len = num.length;
        // Base cases
        if (len == 0) {
            System.out.println("empty string");
        if (len > 4) {
                "Length more than 4 is not supported");
        String[] single_digits = new String[] {
            "zero", "one", "two",   "three", "four",
            "five", "six", "seven", "eight", "nine"
        String[] two_digits = new String[] {
            "",          "ten",      "eleven",  "twelve",
            "thirteen",  "fourteen", "fifteen", "sixteen",
            "seventeen", "eighteen", "nineteen"
        String[] tens_multiple = new String[] {
            "",      "",      "twenty",  "thirty", "forty",
            "fifty", "sixty", "seventy", "eighty", "ninety"
        String[] tens_power = new String[] { "hundred", "thousand" };
        System.out.print(String.valueOf(num) + ": ");

        if (len == 1) {
            System.out.println(single_digits[num[0] - '0']);
        int x = 0;
        while (x < num.length) { if (len >= 3) {
                if (num[x] - '0' != 0) {
                    System.out.print(single_digits[num[x] - '0'] + " ");
                    System.out.print(tens_power[len - 3] + " ");
            else {
                if (num[x] - '0' == 1) {
                    int sum
                        = num[x] - '0' + num[x + 1] - '0';
                else if (num[x] - '0' == 2
                         && num[x + 1] - '0' == 0) {
                else {
                    int i = (num[x] - '0');
                    if (i > 0)
                        System.out.print(tens_multiple[i] + " ");
                    if (num[x] - '0' != 0)
                        System.out.println(single_digits[num[x] - '0']);
    public static void main(String[] args)


1121: one thousand one hundred twenty one

In conclusion, converting numbers to words is a useful process that transforms numerical values into their corresponding textual representation. This conversion allows for easier interpretation and understanding of numeric information. By breaking down the number into smaller units and applying conversion rules, such as handling special cases, the algorithm can generate an accurate word representation.

The conversion algorithm requires an understanding of numerical systems, string manipulation, and conditional logic. It involves iterating over the digits of the number, grouping them into units, and applying the appropriate conversion rules based on the position and magnitude of each digit. This process can be implemented in various programming languages, including Java, to provide a more human-readable format for numbers.

Converting numbers to words finds applications in various domains, such as finance, report generation, and user interfaces. It improves the readability and comprehension of numerical data, making it easier for users to interpret and work with. By providing a more intuitive representation, number-to-words conversion enhances the overall user experience and facilitates better communication of numeric information.

Frequently Asked Questions

Q1. Why would I need to convert numbers to words?
Converting numbers to words is useful in various applications, such as generating human-readable reports, displaying numbers in user interfaces, or printing checks and invoices. It improves the readability and understanding of numerical information for users.

Q2. How do I handle special cases like numbers between 10 and 19?
Special cases like numbers between 10 and 19 can be handled by including specific word representations for these numbers in your conversion algorithm. Create a lookup table or use conditional statements to handle these unique cases separately.

Q3. What are some challenges in converting numbers to words?
One challenge is handling large numbers, as the conversion algorithm needs to handle units beyond thousands, such as millions, billions, and beyond. Another challenge is handling localization, where the word representations of numbers may vary depending on the language or regional conventions.

Q4. Are there existing libraries or APIs for number-to-words conversion?
Yes, there are libraries available in various programming languages that provide ready-to-use functions or classes for converting numbers to words. For example, in Java, you can use libraries like Apache Commons Lang or NumberToWords.

Q5. Can number-to-word conversion handle decimal numbers?
The standard number-to-words conversion typically handles whole numbers. To convert decimal numbers, you may need to separate the integer and decimal parts, convert them individually, and then combine the word representations.

Q6. How accurate is number-to-words conversion?
The accuracy of number-to-words conversion depends on the implementation and the specific rules used. It’s important to thoroughly test the conversion algorithm and handle various edge cases to ensure accurate results.

Q7. Can number-to-word conversion be used in international contexts?
Yes, number-to-words conversion can be adapted to different languages and regional conventions. It requires localization of the conversion rules and word representations to match the language or region-specific numerical systems.

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