Java: Program than read an integer and calculate the sum of its digits and write the number of each digit of the sum in English

Last update on May 12 2025 13:11:32 (UTC/GMT +8 hours)

Digit Sum in Words

Write a Java program that then reads an integer and calculates the sum of its digits and writes the number of each digit of the sum in English.

Sample Solution:

Java Code:

import java.io.*;

public class Main {
    public static void main(String[] args) {
        // Create a BufferedReader to read input from the user
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        try {
            int sum = 0;
            // Read a line of text from the user
            String str = br.readLine();
            char[] numStr = str.toCharArray();

            // Calculate the sum of the digits in the input number
            for (int i = 0; i < numStr.length; i++) {
                sum += numStr[i] - '0';
            }

            // Print the original number and call the print_number function
            System.out.println("Original Number: " + str);
            print_number(sum);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void print_number(int n) {
        int x;
        int y;
        int z;
        String[] number = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

        // Print the sum of the digits of the number
        System.out.println("Sum of the digits of the said number: " + n);

        if (n < 10) {
            // If the number is less than 10, print the corresponding word
            System.out.println(number[n]);
        } else if (n < 100) {
            // If the number is less than 100, split it into tens and ones
            x = n / 10;
            y = n - x * 10;
            System.out.println("In English: " + number[x] + " " + number[y]);
        } else {
            // If the number is three digits, split it into hundreds, tens, and ones
            x = n / 100;
            y = (n - x * 100) / 10;
            z = n - x * 100 - y * 10;
            System.out.println("In English: " + number[x] + " " + number[y] + " " + number[z]);
        }
    }
}

If input 8

Sample Output:

Original Number: 8
Sum of the digits of the said number: 8
eight

Flowchart:

For more Practice: Solve these Related Problems:

• Modify the program to return the sum of digits in Roman numerals.
• Write a program to count how many times each digit appears in the sum.
• Modify the program to return the sum of digits for multiple numbers in an array.
• Write a program to convert the entire number to words instead of just the sum.

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