Question

Challenge 1 - SumDigits.java

Write a program that reads an integer between 0 and 1000 and adds all the digits in the integer. For example, if an integer is 837, the sum of all digits is 18.

Sample output: Enter an integer between 0 and 1000: 837 The sum of all digits in 837 is 18

Answer 1

//SumDigits.java
import java.util.Scanner;
public class SumDigits {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        int n;
        System.out.print("Enter an integer between 0 and 1000: ");
        n = scanner.nextInt();
        System.out.println("The sum of all digits in 837 is "+sumOfDigits(n));
    }

    public static int sumOfDigits(long n){
        int result = 0;
        while(n>0){
            result += (n%10);
            n = n / 10;
        }
        return result;
    }
}