# Thread: help w/ storing/scanning numbers in arrays

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## 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

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

Java 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[]midTerm1= new double [10];
for (int A = 0; A <midTerm1.length; A++){
midTerm1[A] = input.nextInt();
}
System.out.println("Now");

double[]midTerm2=new double[10];
for(int B=0; B<midTerm2.length;B++){
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++){
finalExam[C] = input.nextInt();
}
int [] grades = new int [10];
int max = 0;

//Display highest score
for (int t = 0; t < grades.length; t ++)
{
{
}

System.out.print("Your highest test score is: " + max);

//Display lowest score
int min = 0;
{
}
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
http://www.javaprogrammingforums.com...html#post21185
Last edited by clemsontigers; 11-18-2010 at 02:46 AM.

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When posting code can you please use the code formatter. Put
Java Code:
` before your code and then`
at the end. It makes it easier to debug.

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Java Code:
```//Display highest score
for (int t = 0; t < grades.length; t ++)
{
{
}

System.out.print("Your highest test score is: " + max);

//Display lowest score
int min = 0;
{
}
System.out.print("Your lowest test score is: " + min);
}```

You won't know about the minimum and maximum scores until after the for loop has finished and checked everybody's score. So move the System.out.print() statements to after the for loop.

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On the formatting, I think Allspark meant: put [CODE] before your code and the [/CODE] at the end.

5. Originally Posted by Allspark
When posting code can you please use the code formatter. Put
Java Code:
` before your code and then`
at the end. It makes it easier to debug.
That was written as:

Put [code] before your code and then [/code] at the end.

And the previous line was written using a little trick to mislead that stupid forum software. ;-)

kind regards,

Jos

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here is my updated code and after i run it and enter a number it gives me this error

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

Java 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[] midTerm1 = new double[10];
double[] midTerm2 = new double[10];
double[] finalExam = new double[10];

for (int i=0; i<finalExam.length; i++ ) {
grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
}
midTerm1[10] = input.nextDouble();

System.out.println("Now");

for(int B=0; B<midTerm2.length;B++){
}
midTerm2[10] = input.nextDouble();

System.out.println("Now");

for(int C = 0; C<finalExam.length; C++){
}
finalExam[10] = input.nextDouble();

//Display highest score
for (int t = 0; t < grades.length; t ++)
{
{
}

System.out.print("Your highest test score is: " + max);

//Display lowest score
{
}
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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Java Code:
` midTerm1[10] = input.nextDouble();`
midTerm1[10] does not exist, arrays(and computers)begin counting from 0, if you want the tenth element use 9, 0-9 is ten elements.

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

Java 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[] midTerm1 = new double[9];
double[] midTerm2 = new double[9];
double[] finalExam = new double[9];

for (int i=0; i<finalExam.length; i++ ) {
grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
}
midTerm1[9] = input.nextDouble();

System.out.println("Now");

for(int B=0; B<midTerm2.length;B++){
}
midTerm2[9] = input.nextDouble();

System.out.println("Now");

for(int C = 0; C<finalExam.length; C++){
}
finalExam[9] = input.nextDouble();

//Display highest score
for (int t = 0; t < grades.length; t ++)
{
{
}

System.out.print("Your highest test score is: " + max);

//Display lowest score
{
}
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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You just declare your arrays with a lenght of 9, index in array starts with zero meaning when
you declare
Java Code:
`    double[] midTerm1 = new double[9];`
it means that the maximum index is 8.
Java Code:
`    midTerm1[8] = something;`

Look at this line. You put 9 in midTerm1 index which gives you error because 9th midTerm1 is
actually midTerm1[8].
Java Code:
`    midTerm1[9] = input.nextDouble();`

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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.

100
Now
90
Now
90
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]

Java 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[] midTerm1 = new double[9];
double[] midTerm2 = new double[9];
double[] finalExam = new double[9];

for (int i=0; i<finalExam.length; i++ ) {
grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
}
midTerm1[8] = input.nextDouble();

System.out.println("Now");

for(int B=0; B<midTerm2.length;B++){
}
midTerm2[8] = input.nextDouble();

System.out.println("Now");

for(int C = 0; C<finalExam.length; C++){
}
finalExam[8] = input.nextDouble();

//Display highest score
for (int t = 0; t < grades.length; t ++)
{
{
}

System.out.print("Your highest test score is: " + max);

//Display lowest score
{
}
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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As stated in instruction, prompt the user to enter 10 grades each for midTerm1, midTerm2 and FinalExam. After the user input these that is the time you compute its total.

But what you did is,
Java Code:
```[b]You compute the total first[/b]
for (int i=0; i<finalExam.length; i++ ) {
grades[i] = midTerm1[i] + midTerm2[i] + finalExam[i];
}```

Then prompt the user to enter midTerm grades only ONCE.
Java Code:
```	        System.out.println("Please enter a MidTerm1 grade:");
midTerm1[8] = input.nextDouble();

System.out.println("Now");

for(int B=0; B<midTerm2.length;B++){
}
midTerm2[8] = input.nextDouble();

System.out.println("Now");

for(int C = 0; C<finalExam.length; C++){
}
finalExam[8] = input.nextDouble();```

and pass the value to the last index of you array
Java Code:
```            midTerm1[8] = input.nextDouble();
midTerm2[8] = input.nextDouble();
FinalExam[8] = input.nextDouble();```

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prolly sound like an idiot but im not really sure what to do now

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Your first post to ask the user to enter the grades is correct but not the array, ok...

Also you have logical error in getting the minimum grade. But maybe we can discuss that after you fix the "asking for grades 10x"...

:)

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OK, I read your first/orignal post, it is perfectly correct. The only error is

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I also read that pbrockway told you to move the System.out.println(...) after the loop, what he means
is ONLY the one that prints the highest and lowest grade.

Here is the code that should looks on what pbrockway means.
Java 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[]midTerm1= new double [10];
for (int A = 0; A <midTerm1.length; A++){
midTerm1[A] = input.nextInt();
}
System.out.println("Now");

double[]midTerm2=new double[10];
for(int B=0; B<midTerm2.length;B++){
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++){
finalExam[C] = input.nextInt();
}
int [] grades = new int [10];
[b]
int max = 0;

//Display highest score
for (int t = 0; t < grades.length; t ++)
{
}

int min = 0;
//Display lowest score
{
}

}

System.out.print("Your highest test score is: " + max);
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));
[/b]
}
}```
Compare your original post in this thread to the bold fonts in this code.

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