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Having trouble with a HS GPA(4.0 scale) Calculator

L_Dante

By L_Dante
in PHP Coding Help

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L_Dante Newbie

L_Dante

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I understand the basics of PHP enough to make forms and such and even a little to do calculations, but I've run into a little bit of a snag. What seemed like it would be extremely simple has advanced to a little more than I could chew. I can't figure out how to set a letter(grades, i.e. a b c d f) equal to its corresponding value(a=4, b=3, c=2, d=1, f=0). Simple for most of you... I can't seem to put it in the right order nor figure out a way to successfully calculate it with all the properties for the GPA.

 

If you aren't aware the way to calculate a GPA is you have a set number of classes(1-6) and each class you get a grade, ABCDF, add the variables together then divide by the number of classes.

 

It is set like this: a=4 b=3 c=2 d=1 f=0 x=classes(1-6)

GPA= grade from each class added together/x

 

Trouble is I have to make a html dropdown list stating 1-6 then having it list several forms underneath(# of forms depends on dropdown list) and having each grade be entered as the letter itself and have a calculate button that will add the values then divide by the number of classes... I don't know how to retain the # of classes on the same page.

 

I have no idea how to make it organized but if you have ideas, please let me know. :)

 

I have been trying for hours on this, I really need tips and examples and solutions. I'm a n00b at this web design in general and I know this is a large endeavor but I hope to learn a lot from it.

 

Thank you very much for helping/considering to help.

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L_Dante Newbie

L_Dante

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I remade a layout for it with html... I'd like to incorporate PHP into still

 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
				<p class="subhead">High School 4.0 GPA Calculator<div id="content">

					<p>
	<form id="gpa_calculator" action="gpa.php" method="post" name="gpa_calculator" target="_self"> 
<!-- the above string was on the website  -->
		<fieldset>
			<table border="0" cellspacing="2" cellpadding="0">
				<tr align="right">
					<td width="133">Number of Courses:</td>
					<td><input type="text" name="number_of_courses" value="6" size="4" /></td>
				</tr>
			</table>
			<p><input type="submit" name="submit" value="Submit" /></p>

		</fieldset>
		<p></p>
		<fieldset>
			<table border="0" cellspacing="2" cellpadding="0">
				<tr>
					<td align="center" width="90"></td>

					<td align="center" width="90">Grade</td>

				</tr>
			<tr>
				<td align="center" width="90">Course 1 : </td>
	                        <td align="center" width="90">							<select name="grademenu2">

						<option value="1" selected>A</option>
						<option value="2">B</option>
						<option value="3">C</option>
						<option value="4">D</option>
						<option value="5">F</option>
					</select>
				</td>

			</tr>
			<tr>
				<td align="center" width="90">Course 2 : </td>
				<td align="center" width="90">							<select name="grademenu2">
						<option value="1" selected>A</option>
						<option value="2">B</option>
						<option value="3">C</option>
						<option value="4">D</option>
						<option value="5">F</option>
					</select>
				</td>
			</tr>

			<tr>
				<td align="center" width="90">Course 3 : </td>
				<td align="center" width="90">							<select name="grademenu3">
						<option value="1" selected>A</option>
						<option value="2">B</option>
						<option value="3">C</option>
						<option value="4">D</option>
						<option value="5">F</option>
					</select>
				</td>
			</tr>
			<tr>

				<td align="center" width="90">Course 4 : </td>
				<td align="center" width="90">							<select name="grademenu4">
						<option value="1" selected>A</option>
						<option value="2">B</option>
						<option value="3">C</option>
						<option value="4">D</option>
						<option value="5">F</option>
					</select>
				</td>
			</tr>
			<tr>
				<td align="center" width="90">Course 5 : </td>
				<td align="center" width="90">							<select name="grademenu5">
						<option value="1" selected>A</option>
						<option value="2">B</option>
						<option value="3">C</option>
						<option value="4">D</option>
						<option value="5">F</option>

					</select>
				</td>
			</tr>
			<tr>
				<td align="center" width="90">Course 6 : </td>

				<td align="center" width="90">							<select name="grademenu6">
						<option value="1" selected>A</option>
						<option value="2">B</option>
						<option value="3">C</option>
						<option value="4">D</option>
						<option value="5">F</option>
					</select>

				</td>
			</tr>
			</table>
			<p><input type="submit" name="submit" value="Submit" /></p>
			<table border="0" cellspacing="2" cellpadding="0">
				<tr align="right">
				</tr>
				<tr align="right">

					<td>Current GPA:</td>
					<td align="left"><b>0.000</b></td>
				</tr>

			</table>
		</fieldset>
		<p></p>

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  • 2 weeks later...
blackcell Regular Member

blackcell

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Are you trying to do this with PHP?  It looks like all html.  If your trying to make a determination on how to output a Grade letter depending on a number, I would use a few traps like:

 

if($gradeNumber < 60)$gradeLetter = "F";
if($gradeNumber >= 60)$gradeLetter = "D";
if($gradeNumber => 70)$gradeLetter = "C";
if($gradeNumber => 80)$gradeLetter = "B";
if($gradeNumber => 90)$gradeLetter = "A";

Since PHP executes Top-Down, it may satisfy more than one of the above statements but it end up with the correct Letter Grade.  If system optimization is an issue you may want to use a more sophisticated statement.

 

If your doing multiple classes, just set a few variables and average the overall by the number of classes.

 

$classesNumber = 6;
$class1 = 70;
$class2 = 90;
$class3 = 80;
$class4 = 60;
$class5 = 90;
$class6 = 80;

$gradeNumber = ($class1 + $class2 + $class3 + $class4 + $class5 + $class6) / $classesNumber;

f($gradeNumber < 60)$gradeLetter = "F";
if($gradeNumber >= 60)$gradeLetter = "D";
if($gradeNumber => 70)$gradeLetter = "C";
if($gradeNumber => 80)$gradeLetter = "B";
if($gradeNumber => 90)$gradeLetter = "A";

//Display Final Grade Letter
echo"$gradeLetter";

 

I don't know if this answered your question.

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