Java: Adds all the digits in the integer between 0 and 1000

Last update on May 14 2025 13:02:09 (UTC/GMT +8 hours)

Sum of Digits in Integer

Write a Java program that reads an integer between 0 and 1000 and adds all the digits in the integer.

An integer is a number that can be written without a fractional component. For example, 23, 6, 0, and −1245 are integers, while 3.25, 7 1⁄2, and √3 are not.

Test Data
Input an integer between 0 and 1000: 565

Java datatype Exercises: Adds all the digits in the integer between 0 and 1000

Sample Solution:

Java Code:

import java.util.Scanner;
public class Main {

    public static void main(String[] Strings) {

        Scanner input = new Scanner(System.in);

        System.out.print("Input an integer between 0 and 1000: ");
        int num = input.nextInt();

        int firstDigit = num % 10;
        int remainingNumber = num / 10;
        int SecondDigit = remainingNumber % 10;
        remainingNumber = remainingNumber / 10;
        int thirdDigit = remainingNumber % 10;
        remainingNumber = remainingNumber / 10;
        int fourthDigit = remainingNumber % 10;
        int sum = thirdDigit + SecondDigit + firstDigit + fourthDigit;
        System.out.println("The sum of all digits in " + num + " is " + sum);

    }
}

Sample Output:

Input an integer between 0 and 1000: 565                                                                      
The sum of all digits in 565 is 16

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to compute the product of the digits of an integer and compare it with the sum of the digits.
Write a Java program to recursively calculate the digital root of an integer by repeatedly summing its digits until a single digit is obtained.
Write a Java program to compute the sum of only the even digits of an integer without converting the integer to a string.
Write a Java program to sum the digits of an integer while also counting the frequency of each digit from 0 to 9.

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Java Code Editor:

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