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Thread: error related arrays outputting wront data...

  1. #1
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    Default error related arrays outputting wront data...

    I've debugged this program for an hour and a half now i figure its time to post here's my code
     
    package chapter13;
    import java.util.Scanner;
    /**
    * @author Austin Calkins
    */
    public class Percentile {

    static double highestPercent = 0;
    static int highestScore = 0;

    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String[] name = new String[100];
    // Student a[] = new Student[100];
    // System.out.println(a.getName());
    double[][] marks = new double[100][2];
    int numEntries = 0;
    int numGreator = 0;

    for (int loop = 0; loop < 100; loop++) {
    System.out.println("name: ");
    String temp = sc.next();
    if (temp.equalsIgnoreCase("stop"))
    break;
    System.out.println("mark: ");
    int tempMark = sc.nextInt();
    numEntries++;
    name[loop] = temp;
    for (int i = 0; i < numEntries; i++) {
    if (tempMark > marks[i][0]) {
    for (int k = numEntries - 1; k < i; k--) {
    marks[k][0] = marks[k - 1][0];
    }
    marks[i][0] = tempMark;
    name[i] = temp;
    break;
    }
    }
    }// end for input
    for (int loop = 0; loop < numEntries; loop++) {
    for (int loop2 = 0; loop2 < numEntries; loop2++) {
    if (marks[loop][0] >= marks[loop2][0]) {
    numGreator++;
    }
    }
    double percentile = ((double) numGreator / (double) numEntries) * 100.0;
    marks[loop][1] = percentile;
    numGreator = 0;
    }

    for (int loop = 0; loop < numEntries; loop++) {
    System.out.println(name[loop] + ": percentile: " + marks[loop][1]);
    }
    }// end main
    }// end class



    i entered fred 72, mark 60, sally 90, austin 95, rick 95,
    and the names were wrong and wo were the bottom three percentiles please help
    Last edited by semicolon; June 1st, 2011 at 09:20 AM. Reason: wrong BB code


  2. #2
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    Default Re: error related arrays outputting wront data...

    What output did you expect? What was your actual output? Have you stepped through this with a debugger, or at least added some print statements to figure out what's going on? And do you really not indent your code?
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  3. #3
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    Default Re: error related arrays outputting wront data...

    no the forum BB code wont indent it, here is the output
    austin: percentile: 100.0
    rick: percentile: 100.0
    sue: percentile: 60.0
    austin: percentile: 60.0
    rick: percentile: 60.0

    i expected
    austin: percentile:100
    rick :percentile: 100
    sue :percentile: 60
    fred :percentile:40:
    sally :percentile:20
    Last edited by semicolon; June 1st, 2011 at 09:15 AM.

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    Default Re: error related arrays outputting wront data...

    It preserves indentation if you use the highlight tags.

    What is your program actually supposed to do though? What do those percentile outputs represent? And what happened when you stepped through this with a debugger?
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    Super Moderator Norm's Avatar
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    Default Re: error related arrays outputting wront data...

    The numbers in your expected output look like ints. Have you tried converting the double values to int values? Many ways to do this.
    First do the marks have to be double?
    Otherwise convert the double values to int values when printing them

  6. #6
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    Default Re: error related arrays outputting wront data...

    the problem is in the for loop, the program determines the percentile of each student by taking in his name and mark and finding the percentile by comaring his score to other classmates, if he is greater than or equal to all class mates then numStudentshe is greator than / totalNumStudents, if he got a 100, and 5 other kids got 95 he was greator than or equalto all other students including himself so he is in the 100 percentile and everyone else is in 83.333 percentile

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