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Thread: Rookie here, need help with sum of digits program

  1. #1
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    Default Rookie here, need help with sum of digits program

    I am completely new to java and am very lost on a current program I am working on. I cannot figure out what code to add in or use when it comes to extracting the digits using an operator.

    Here is my instructions:

    Write a program that reads an integer from 0 to 999 from the keyboard and then adds up all the digits in the integer. For example, if the integer is 735 then the sum of the digits is 7+3+5=15.

    (This is the current code I have so far) Any help is appreciated.

    1  import java.util.Scanner;
    2   /**
    3  *
    4  * @author willkellogg
    5  */
    6  public class SumDigits {
    7     public static void main(String[] args) {
    8     Scanner input = new Scanner(System.in) ;
    9     
    10      //input
    11      System.out.println("Enter a number from 0 to 999: ") ;
    12      double digit1 = input.nextDouble() ;
    13      double digit2 = input.nextDouble() ;
    14      double digit3 = input.nextDouble() ;
    15      
    16      //process
    17      double average  = (digit1 + digit2 + digit3) / 3 ;
    18      
    19     
    20      //output
    21      System.out.println("The sum of the digit is " + digit1 + "" + digit2 + "" 
    22                          + digit3 + "is" + average) ;
     
     
     
          }
    }


  2. #2
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    Default Re: Rookie here, need help with sum of digits program

    Your code is not following the assigment: program that reads an integer
    The first fix for the program is to change what it reads from three doubles to one int.

    The trick for isolating digits in a number is by using the % and / operators:
    132 % 10 = 2
    132 / 10 = 13
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Rookie here, need help with sum of digits program

    .

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