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Java Exercises: Compute the sum of the digits of an integer

Java Basic: Exercise-33 with Solution

Write a Java program and compute the sum of the digits of an integer.

Test Data:
Input an intger: 25

Pictorial Presentation:

Java: Compute the sum of the digits of an integer

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise33 { 
 public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Input an integer: ");
        long n = input.nextLong();
        System.out.println("The sum of the digits is: " + sumDigits(n));

    }

    public static int sumDigits(long n) {
        int sum = 0;
        while (n != 0) {
            sum += n % 10;
            n /= 10;
        }
        return sum;
    }
}

Sample Output:

Input an intger: 25                                                                                           
The sum of the digits is: 7 

Flowchart:

Flowchart: Java exercises: Compute the sum of the digits of an integer

Java Code Editor:

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Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt