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Thread: Simple averaging program using two different classes

  1. #1
    Junior Member Crash's Avatar
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    Default Simple averaging program using two different classes

    This is a simple project that i was using to test my current java knowledge (kinda like revision) and for that i used two classes to make a simple averaging program. i know i0m making it more difficult but like i said i'm testing myself but i come up with an unexpected error. Here's the code:

    - 1st Class
    import java.util.Scanner;
     
    public class Main {
     
    	public static int num;
    	public static int total = 0;
    	public static int average;
     
    	public static void main(String args[]) {
    		Scanner scanner = new Scanner(System.in);
     
    		Secondary secondaryObject = new Secondary();
    		secondaryObject.loop(num, total, scanner);
     
                    average = total/3;
     
    		System.out.println("Average: " + average);
    	}
    }

    - 2nd Class
     import java.util.Scanner;
     
    public class Secondary {
    	public void loop(int num, int total, Scanner scanner) {
    		int counter = 0;
     
    		while(counter < 3) {
    			num = scanner.nextInt();
    			total += num;
    			counter++;
    		}
    	}
    }

    Now the problem is after inputing the numbers it doesn't give me the average but the value of 0. Althought this is not that big of a deal that just made me want to know why and if you could tell me that would be much appreciated.
    Last edited by Crash; April 9th, 2014 at 10:25 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Simple averaging program using two different classes

    doesn't give me the average but the value of 0.
    How is the average computed? What variable has the total and what variable the count? What variable is assigned the average?

    Is integer math being used: 4/5 = 0 vs floating math: 4/5.0 = 0.8
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Junior Member Crash's Avatar
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    Default Re: Simple averaging program using two different classes

    What i did was creating a variable to hold the inputed numbers and then one to hold the total. Then this two are asigned with the while loop in the 2nd Class being num the inputed value and total the adition of num values each time the loop runs. Now the problem is with the average variable that insted of outputting total divided by three outputs 0. My thought is that the error is with the num variable assignment or with the total variable assignment in the while loop (but of course just a thought).

    Sorry but i still dont know the difference betwen integer math and floating math.

    --- Update ---

    To demonstrate a working code i made the program using only one class. Here's the code:
    import java.util.Scanner;
     
    public class MainEXAMPLE {
    	public static void main(String args[]) {
    		Scanner scanner = new Scanner(System.in);
     
    		int num;
    		int total = 0;
    		int average;
    		int counter = 0;
     
    		while(counter < 3) {
    			num = scanner.nextInt();
    			total += num;
    			counter++;
    		}
     
    		average = total/3;
     
    		System.out.println("Average: " + average);
    	}
    }

    This code works and in the end it gives the correct average. Hope it's useful.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Simple averaging program using two different classes

    the difference between integer math and floating math.
    An example: integer math: 4/5 = 0 vs floating math: 4/5.0 = 0.8
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
    Junior Member Crash's Avatar
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    Default Re: Simple averaging program using two different classes

    Got it now. I'm using integer math.

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