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-   -   I don't know how to start (http://www.daniweb.com/forums/thread15664.html)

Jounan Dec 16th, 2004 6:02 am
I don't know how to start
 
Hi everybody,

I am new to JavaScript and need help to start, please help to Write the script to calculate grades. Up to 10 scores can be entered. The raw scores are curved and grades are assigned. Click the "Load" button to work with the example scores. If the average is below 75, make it 75.

Assume the following 10 scores: 40, 46, 48, 56, 62, 64, 66, 70, 76, and 78. Enter the scores and press button Load. The average will be given as 60.5 ~61 so we have to add 14 (75-61) to every score. This is done by pressing button Curve.


Assume that the grades are assigned as follows: 90-100 = A, 80-89 = B, 70-79 = C, 60-69 = D, below 60 = F. The grade will be displayed by pressing button Grades.


Your help is much much appreciated.

Regards :cry:

beckerc Dec 16th, 2004 8:42 am
Re: I don't know how to start
 
I do not wish to do your homework for you but i will give you a start :}

Look at my problem i posted. that works fine for taking in a numeric value and adding it to another value. you want to create additional variables called 'total' and 'scores entered' or something like that and rather than set the value to form element like i am doing in my function, you want to add the value to total every time the fuction is called (maybe you have 2 buttons, one is enter test score, and another is grade)

so you collect all your test scores and click grade which calls a grade function that looks at total/scores enterd to give the average and converts it to a letter grade (use if statements)

that should be a good start. try something, post some code and i will help you more.

Jounan Dec 16th, 2004 11:46 am
Re: I don't know how to start
 
I appreciate your help, but my knowledge to JavaScrip is "0", even i don't know how to start, I use notepad and save it as HTML. I tried it but it didn't work. below is class-average example:

import javax.swing.JOptionPane;

public class Average1 {

public static void main( String args[] )
{
int total; // sum of grades input by user
int gradeCounter; // number of grade to be entered next
int grade; // grade value
int average; // average of grades

String gradeString; // grade typed by user

// initialization phase
total = 0; // initialize total
gradeCounter = 1; // initialize loop counter

// processing phase
while ( gradeCounter <= 10 ) { // loop 10 times

// prompt for input and read grade from user
gradeString = JOptionPane.showInputDialog(
"Enter integer grade: " );

// convert gradeString to int
grade = Integer.parseInt( gradeString );

Please help me to do this, I can't even start.

Regards

beckerc Dec 16th, 2004 1:32 pm
Re: I don't know how to start
 
That looks like java. Are you trying to do this in java or as a javascript in an html page?

I will look into a base page to post up in a bit. I am assuming you are doing this in an html page using javascript.

Jounan Dec 18th, 2004 3:03 am
Re: I don't know how to start
 
Yes, I am doing html page using javascript.

regards

beckerc Dec 20th, 2004 8:06 am
Re: I don't know how to start
 
ok, I hope i am not too late. I did not check this over weekend.

here is a start. It has many bugs, but like i said, I want you to learn from this so you need to figure things out. I used to teach at college so I can't just give it to you.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

  

<title>quick sample for someone</title>



<script language="JavaScript">

/***************************************************************

* Function: isValidFloat(num)                                                                   

* Description: This function will check for a valid Float

****************************************************************/

function isValidFloat(num)

{          

    var valid = "0123456789.";

        var temp;

        var decimalPointCount=0;

        

        for (var i = 0; i < num.length; i++)

        {

                temp = num.substring(i, i + 1);

                if(temp==".")

                        decimalPointCount++;

                if (decimalPointCount > 1)

                {

                        return false;

                }

                if (valid.indexOf(temp) == "-1")

                {                

                        return false;

                }

        }

        return true;

}  







nTotalScores = 0;

nNumberOfScores =0;



function getScores(num){

nTotalScores = nTotalScores + num;

nNumberOfScores = nNumberOfScores + 1;



}









function getGrade( ) {

        var returnGrade = '';

        

        

         

        if(  )

                alert("the grade is" + )

        else if(  )

                alert("The )

        else if(  ) 

                alert("")

        else if(  ) 

                        alert("A Product Price 2 must have an Effective Date. Please select a second Effective Date.")

                        

                    

        else returnGrade = 'f'

        return returnGrade         

}        





/***************************************************************



* Function: trim(str)                                                                                               



* Description: This function will trim the spaces in a string



****************************************************************/



function trim(str) { 



            //Remove leading spaces...



            while (str.substring(0,1) == ' ') {



                        str = str.substring(1, str.length);



            }



 



            //Remove trailing spaces...



            while (str.substring(str.length-1, str.length) == ' ') {



                        str = str.substring(0, str.length-1);



            }



 



    return str;



}









</script>



<META name="GENERATOR" content="IBM WebSphere Studio">

</head>



 <body>

<form name ="someForm">

<table>

<TR ><TD> enter a score and click button </td><td><td><input type="text" name ="something"> <input type="submit"  onclick="javascript:getScores(document.someForm.something);" > </td></tr>

</table>

</form>

</body>

</html>

beckerc Dec 23rd, 2004 9:40 am
Re: I don't know how to start
 
Was that of any benefit? I think it gives you almost everything you need to do the problem specified. Please ask any questions. I would like to help, but i do not want to do your work for you.


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