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Thread: How to divide elements in two different arrays

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    Default How to divide elements in two different arrays

    I am using an array to store 5 test scores. Then I have another array for the total possible score the test could have. I just need to find out what percent the grade is out of the total possible score.

    public class Main {
     
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            int[] grade = new int[5];
            int[] outOf = new int[5];
            int[] percents = new int[5];
     
     
            int total = 0;
            int average;
            int percent;
     
            grade[0] = 70;
            grade[1] = 65;
            grade[2] = 120;
            grade[3] = 150;
            grade[4] = 30;
     
            outOf[0] = 210;
            outOf[1] = 100;
            outOf[2] = 150;
            outOf[3] = 200;
            outOf[4] = 50;
     
            for(int i=0;i<grade.length;i++)
            {
                total += grade[i];
     
            }
     
            average = total / 5;
     
            System.out.println("The total is " + total + "\nThe"
                    + " average is " + average);
            }
     
            for(int j=0;j<grade.length;j++)
            {
     
     
            }
    }


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    Default Re: How to divide elements in two different arrays

    I just need to find out what percent the grade is out of the total possible score.
    Divide one by the other and multiply by 100.

    Just a recommendation, but using an Object Oriented approach you could get the results fairly easily. For example, if you created a class called Test that contains the score and total possible score - the data is inherently packaged together in a way than can be easily understood and manipulated.

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    Default Re: How to divide elements in two different arrays

    Yeah I know thats the formula on how to get the percent, but I dont know how to implement that. I have tried:
             percents[0] = (grade[0] / outOf[0]) * 100;
     
            System.out.println(percents[0]);

    I am getting 0 as an output though. Why is this?

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    Default Re: How to divide elements in two different arrays

    grade[0] = 70;
    outOf[0] = 210;
    As you are using Integers:

    70/210 will give you 0.

    0 * 100 will give you 0.
    Last edited by newbie; February 11th, 2011 at 04:00 PM.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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    Default Re: How to divide elements in two different arrays

    You have to use floats or doubles instead. Integer doesn't provide you anything after decimal point.

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