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Thread: help w/ storing/scanning numbers in arrays

  1. #1
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    Default help w/ storing/scanning numbers in arrays

    these are my instructions
    A Computer Technology Instructor has a small class of 10 students. The instructor evaluates the performance of students in the class by administering 2 midterm tests and a Final Exam.

    Write a program that prompts the instructor to enter the 10 grades of Midterm 1 and store these numbers in an array. Next prompt for the 10 grades of Midterm2 and store these numbers in a different array. Next prompt for the 10 grades of the Final Exam and store these in a different array. Next add Midterm1 to Midterm2 to Final and store the total of grades in a different array. Next, scan the array that has the totals and identify the minimum grade and maximum grade. Inform the instructor of the minimum grade and maximum grade.

    Note : do not assume that the grades are in the range 0 to 100. Your program should function properly whether the grades are in the range 0 to 100 or any other range.
    *I'm using eclipse btw

    it prompts me to enter my numbers and stores them in the array correctly but when it tells me what my lowest score it says 0.0 and my highest score is 0.0...also, im not sure exactly how to add the total of midterm1 to midterm2 to final exam or how scan the array..and it repeats my highest and lowest score

    so far this is my output after i enter the grades

    Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0Your highest test score is: 0Your lowest test score is: 0You have entered following grades for midTerm1: [2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0]
    You have entered following grades for midTerm2: [2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0]
    You have entered following grades for Final Exam: [2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0]

    here is my code

    import java.util.Scanner;
    import java.util.Arrays;
     
    public class Assign9_Roberts
     
    {
    	public static void main(String[] args)
    	{
    		//input scanner
    		Scanner input = new Scanner(System.in);
     
    			//Prompt User for midterm1 grades
    			double[]midTerm1= new double [10];
                for (int A = 0; A <midTerm1.length; A++){
                    System.out.println("Please enter MidTerm1 grade:");
                    midTerm1[A] = input.nextInt();
                }
                 System.out.println("Now");
     
               //Prompt User for midterm2 grades
                double[]midTerm2=new double[10];
                for(int B=0; B<midTerm2.length;B++){
                   System.out.println("Please enter a MidTerm2 grade:");
                   midTerm2[B] = input.nextInt();
                }
                System.out.println("Now");
     
              //Prompt User for Final Exam grades
                double[]finalExam = new double[10];
                for(int C = 0; C<finalExam.length; C++){
                	System.out.println("Please enter a Final Exam grade:");
                	finalExam[C] = input.nextInt();
                }
                int [] grades = new int [10];
    			int max = 0;
     
    		   //Display highest score
    			for (int t = 0; t < grades.length; t ++)
    			{
    				if (grades[t] > max)
    				{
    					max = grades[t];
    				}
     
    				System.out.print("Your highest test score is: " + max);
     
    			//Display lowest score
    			int min = 0;
    				if(grades[t] < min)
    				{
    					min = grades[t];
    				}
    				System.out.print("Your lowest test score is: " + min);
        			}	
     
              System.out.print("You have entered following grades for midTerm1:    ");
              System.out.println(Arrays.toString(midTerm1));
              System.out.print("You have entered following grades for midTerm2:    ");
              System.out.println(Arrays.toString(midTerm2));
              System.out.print("You have entered following grades for Final Exam:   ");
              System.out.println(Arrays.toString(finalExam));
     
    			}
     
    			}

    also this is cross posted...thanks guys
    help w/ storing/scanning numbers in arrays - Java Forums
    Last edited by robertsbd; November 17th, 2010 at 01:15 PM.


  2. #2
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    Default Re: help w/ storing/scanning numbers in arrays

    /Display highest score

       for (int t = 0; t < grades.length; t ++)
                {
                    if (grades[t] > max)
                    {
                        max = grades[t];
                    }

    Well, since you put nothing in your grades array, all the values are null.

  3. #3
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    Default Re: help w/ storing/scanning numbers in arrays

    ok here is my updated code...when i run it, it prompts me to enter a grade and when i do i receive this error:

    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 10
    at Assign9_Roberts.main(Assign9_Roberts.java:29)



    import java.util.Scanner;
    import java.util.Arrays;
     
    public class Assign9_Roberts
     
    {
    	public static void main(String[] args)
    	{
    		//input scanner
    		Scanner input = new Scanner(System.in);
     
    		  double[] grades = new double[10];
    	      double[] midTerm1 = new double[10];
    	      double[] midTerm2 = new double[10];
    	      double[] finalExam = new double[10];
     
     
    	        // add midterm1 , midterm2 and final grades and store them in grade array
    	        for (int i=0; i<finalExam.length; i++ ) {
    	            grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
    	        }
    	        System.out.println("Please enter a MidTerm1 grade:");
                midTerm1[10] = input.nextDouble();
     
     
                 System.out.println("Now");
     
                for(int B=0; B<midTerm2.length;B++){
                }
                System.out.println("Please enter a MidTerm2 grade:");
                midTerm2[10] = input.nextDouble();
     
                System.out.println("Now");
     
                for(int C = 0; C<finalExam.length; C++){
                }
                System.out.println("Please enter a Final Exam grade:");
            	finalExam[10] = input.nextDouble();
     
            	double max = grades[0];
            	double min = grades[0];
     
            	//Display highest score
            	for (int t = 0; t < grades.length; t ++)
            	{
            	   if (grades[t] > max)
            	   {
            	      max = grades[t];
            	   }
     
            	   System.out.print("Your highest test score is: " + max);
     
            	   //Display lowest score
               	   if(grades[t] < min)
            	   {
            	      min = grades[t];
            	   }
            	   System.out.print("Your lowest test score is: " + min);
            	}	
     
              System.out.print("You have entered following grades for midTerm1:    ");
              System.out.println(Arrays.toString(midTerm1));
              System.out.print("You have entered following grades for midTerm2:    ");
              System.out.println(Arrays.toString(midTerm2));
              System.out.print("You have entered following grades for Final Exam:   ");
              System.out.println(Arrays.toString(finalExam));
     
    			}
     
    			}
    Last edited by robertsbd; November 17th, 2010 at 07:54 PM.

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    Default Re: help w/ storing/scanning numbers in arrays

    Arrays are indexed at zero, so if you create an array of size n, the maximum array position you can access is n-1. So in your code, yourarray[10] will be out of bounds, yourarray[9] will be the last index in the array

  5. #5
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    Default Re: help w/ storing/scanning numbers in arrays

    ok i changed that..thanks, but im still getting the same error..here's my updated code

     
    import java.util.Scanner;
    import java.util.Arrays;
     
    public class Assign9_Roberts
     
    {
    	public static void main(String[] args)
    	{
    		//input scanner
    		Scanner input = new Scanner(System.in);
     
    		  double[] grades = new double[9];
    	      double[] midTerm1 = new double[9];
    	      double[] midTerm2 = new double[9];
    	      double[] finalExam = new double[9];
     
     
    	        // add midterm1 , midterm2 and final grades and store them in grade array
    	        for (int i=0; i<finalExam.length; i++ ) {
    	            grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
    	        }
    	        System.out.println("Please enter a MidTerm1 grade:");
                midTerm1[9] = input.nextDouble();
     
     
                 System.out.println("Now");
     
                for(int B=0; B<midTerm2.length;B++){
                }
                System.out.println("Please enter a MidTerm2 grade:");
                midTerm2[9] = input.nextDouble();
     
                System.out.println("Now");
     
                for(int C = 0; C<finalExam.length; C++){
                }
                System.out.println("Please enter a Final Exam grade:");
            	finalExam[9] = input.nextDouble();
     
            	double max = grades[0];
            	double min = grades[0];
     
            	//Display highest score
            	for (int t = 0; t < grades.length; t ++)
            	{
            	   if (grades[t] > max)
            	   {
            	      max = grades[t];
            	   }
     
            	   System.out.print("Your highest test score is: " + max);
     
            	   //Display lowest score
               	   if(grades[t] < min)
            	   {
            	      min = grades[t];
            	   }
            	   System.out.print("Your lowest test score is: " + min);
            	}	
     
              System.out.print("You have entered following grades for midTerm1:    ");
              System.out.println(Arrays.toString(midTerm1));
              System.out.print("You have entered following grades for midTerm2:    ");
              System.out.println(Arrays.toString(midTerm2));
              System.out.print("You have entered following grades for Final Exam:   ");
              System.out.println(Arrays.toString(finalExam));
     
    			}
     
    			}

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    Default Re: help w/ storing/scanning numbers in arrays

    You also reduced the size of the array. Remember, the array indexes start at zero, so the last index is n-1 where n is the size of the array. So setting the size to 9, array[9] will be out of bounds and array[8] the last index. Setting to 10, array[10] will be out of bounds but array[9] the last index.

  7. #7
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    Default Re: help w/ storing/scanning numbers in arrays

    also, trying to submit this assignment within and hour so a quick response is greatly appreciated..thanks

    i updated my code and while im not getting the same error its only allowing me to enter 3 numbers and giving me this out put.

    Please enter a MidTerm1 grade:
    100
    Now
    Please enter a MidTerm2 grade:
    90
    Now
    Please enter a Final Exam grade:
    90
    Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0Your highest test score is: 0.0Your lowest test score is: 0.0You have entered following grades for midTerm1: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0]
    You have entered following grades for midTerm2: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 90.0]
    You have entered following grades for Final Exam: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 90.0]

     
    import java.util.Scanner;
    import java.util.Arrays;
     
    public class Assign9_Roberts
     
    {
    	public static void main(String[] args)
    	{
    		//input scanner
    		Scanner input = new Scanner(System.in);
     
    		  double[] grades = new double[9];
    	      double[] midTerm1 = new double[9];
    	      double[] midTerm2 = new double[9];
    	      double[] finalExam = new double[9];
     
     
    	        // add midterm1 , midterm2 and final grades and store them in grade array
    	        for (int i=0; i<finalExam.length; i++ ) {
    	            grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
    	        }
    	        System.out.println("Please enter a MidTerm1 grade:");
                midTerm1[8] = input.nextDouble();
     
     
                 System.out.println("Now");
     
                for(int B=0; B<midTerm2.length;B++){
                }
                System.out.println("Please enter a MidTerm2 grade:");
                midTerm2[8] = input.nextDouble();
     
                System.out.println("Now");
     
                for(int C = 0; C<finalExam.length; C++){
                }
                System.out.println("Please enter a Final Exam grade:");
            	finalExam[8] = input.nextDouble();
     
            	double max = grades[0];
            	double min = grades[0];
     
            	//Display highest score
            	for (int t = 0; t < grades.length; t ++)
            	{
            	   if (grades[t] > max)
            	   {
            	      max = grades[t];
            	   }
     
            	   System.out.print("Your highest test score is: " + max);
     
            	   //Display lowest score
               	   if(grades[t] < min)
            	   {
            	      min = grades[t];
            	   }
            	   System.out.print("Your lowest test score is: " + min);
            	}	
     
              System.out.print("You have entered following grades for midTerm1:    ");
              System.out.println(Arrays.toString(midTerm1));
              System.out.print("You have entered following grades for midTerm2:    ");
              System.out.println(Arrays.toString(midTerm2));
              System.out.print("You have entered following grades for Final Exam:   ");
              System.out.println(Arrays.toString(finalExam));
     
    			}
     
    			}

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