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Thread: How to begin with multi-dimensional arrays

  1. #1
    Junior Member
    Join Date
    Apr 2012
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    Default How to begin with multi-dimensional arrays

    A little backstory: I have some code written by the gentleman before me. I have practically no java experience, but need to make the code that he started work for our new standards. I have NO clue where to even begin, and would love some helpful guidance.

    The code that we have:
    public class employeeSurveyCalculator {
      public static void main(String args[]) {
        // Employee answers to the survey
        char[][] answers = {
          {'A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
          {'D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'},
          {'E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'},
          {'C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'},
          {'A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
          {'B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
          {'B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
          {'E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'}};
        // Key to the questions
        char[] keys = {'D', 'B', 'D', 'C', 'C', 'D', 'A', 'E', 'A', 'D'};
        // Analyze all answers
        for (int j = 0; j < answers.length; j++) {
        // Check one Employee
          int typeOneCount = 0;
          for (int i = 0; i < answers[j].length; i++) {
            if (answers[j][i] == keys[i])
          } // end for fro j index 
            } // end for for i index
      }// end main method
    } //end class

    We have a survey that we send out to our small teams to check personality compatibility. In particular, we are looking for a certain personality type. These people will be identified by answering the questions a certain way. These answers have been identified and placed in the key array.

    I am supposed to now identify other personality types. This is still in the planning stages, so I have been tasked with expanding this code to create a running count of how many people answer what letter for what question. For example, how many people answer Question 1 with A, with B, with C, etc.

    They tell me this is easy to do, but I am at a complete loss. Can I get some helpful hints to help me on the right track?

    Thank you so much!


  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,708 Times in 2,658 Posts

    Default Re: How to begin with multi-dimensional arrays

    count of how many people answer what letter for what question.
    Create an array of int for counting that has the same number of rows as your answers array and the number of columns for all the possible answers including any skipped letters. There must be elements that span from the lowest letter to the highest letter. A and Z require 26 elements.
    Get the question number and answer. Convert the letter to an index for the elements in a column (Hint: you can do arithmetic with char variables: 'B' - 'A' = 1)
    Add one to the counting array indexed by the question number for the row and the column index.
    If you don't understand my answer, don't ignore it, ask a question.

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