Java Exercises: Add all the digits of a given positive integer until the result has a single digit
Java Basic: Exercise-108 with Solution
Write a Java program to add all the digits of a given positive integer until the result has a single digit.
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.Scanner;
public class Example108 {
public static void main(String[] arg) {
Scanner in = new Scanner(System.in);
System.out.print("Input a positive integer: ");
int n = in.nextInt();
if (n>0)
{
System.out.print("The single digit number is: "+(n == 0 ? 0 : (n % 9 == 0 ? 9 : n % 9)));
}
System.out.println("\n");
}
}
Sample Output:
Input a positive integer: 25 The single digit number is: 7
Flowchart:
Java Code Editor:
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Previous: Write a Java program to check if an array of integers contains three increasing adjacent numbers.
Next: Write a Java program to form a staircase shape of n coins where every k-th row must have exactly k coins.
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Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
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