Jump to content

Need Help With PHP Code

MjM8082

By MjM8082
in PHP Coding Help

 Share

Recommended Posts

MjM8082 Member

MjM8082

Posted
Posted

I need help writing a code that will calculate AND display the average of my table. I've been looking through books and online forums but can't seem to find out how to do this. I'm new to PHP also. Figured this would be the best site to come to.

 

This is the code I have so far...

 

 

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Week 1 Lab</title>
</head>

<body>

<?php
if (isset($_POST['btn_submit']))
{
	$number_of_rows = $_POST['number_of_rows'];

	echo "<table cellpadding='10' cellspacing='10' border='1'";
	echo "<tr>";
	for($ii = 0; $ii < $number_of_rows; $ii++)
	{
        echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)
	{
		$my_no = mt_rand(1, 100);



			if (($my_no%2==0)&&($my_no%3==0)) {
				$color="#FF00FF";
			}
			else if ($my_no%2==0) {
				$color="#0000FF"; 
			}
			else if ($my_no%3==0) {
				$color="#FF0000";
			}
			else {
				$color ="#FFFFFF";
			}
			echo "<td style=\"background: {$color};\">$my_no</td>";
		}


		echo "</tr>";
	}


	echo "</table>";
}


?>



<form name="lab1" method="post" action="lab1.php">
<input type="textbox" name="number_of_rows" value="5" />
<input type="submit" name="btn_submit" value="Generate Grid" />
</form>

</body>
</html>

 

Link to comment
https://forums.phpfreaks.com/topic/242752-need-help-with-php-code/
Share on other sites
AyKay47 Member

AyKay47

Posted
Posted

does your table display the layout that you expect it to? I have doubts about the structure, however to find the average this should work for you..

 

if (isset($_POST['btn_submit']))
{
	$number_of_rows = $_POST['number_of_rows'];

	echo "<table cellpadding='10' cellspacing='10' border='1'";
	echo "<tr>";
	for($ii = 0; $ii < $number_of_rows; $ii++)
	{
        echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)
	{
		$my_no = mt_rand(1, 100);



			if (($my_no%2==0)&&($my_no%3==0)) {
				$color="#FF00FF";
			}
			else if ($my_no%2==0) {
				$color="#0000FF"; 
			}
			else if ($my_no%3==0) {
				$color="#FF0000";
			}
			else {
				$color ="#FFFFFF";
			}
			echo "<td style=\"background: {$color};\">$my_no</td>";
		}

	$total += $my_no;
		echo "</tr>";
	}


	echo "</table>";
$average = ($total/$number_of_rows);
print $average;
}

Nodral Regular Member

Nodral

Posted
Posted

Try this

 

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Week 1 Lab</title>
</head>
<body>
<?php
if (isset($_POST['btn_submit']))	{
$number_of_rows = $_POST['number_of_rows'];
echo "<table cellpadding='10' cellspacing='10' border='1'";
echo "<tr>";
for($ii = 0; $ii < $number_of_rows; $ii++)		{
	echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)		{
		$my_no = mt_rand(1, 100);
		$average_calc[]=$my_no;
		if (($my_no%2==0)&&($my_no%3==0)) {
			$color="#FF00FF";
		}
		else if ($my_no%2==0) {
			$color="#0000FF";
		}
		else if ($my_no%3==0) {
			$color="#FF0000";
		}
		else 
		{	
			$color ="#FFFFFF";	
		}				
		echo "<td style=\"background: {$color};\">$my_no</td>";
	}
	echo "</tr>";
}
echo "</table>";
}

$total=array_sum($average_calc);
$count=count($average_calc);
$average=$total/$count;

?>	
<form name="lab1" method="post" action="">
<input type="textbox" name="number_of_rows" value="5" />
<input type="submit" name="btn_submit" value="Generate Grid" />
<?php
echo $average;
?>
</form>
</body>
</html>

 

I've added in

 

line 16 to create an array

 

Lines 37 - 39 to calculate the average

 

Lines 45 - 47 to print on screen

AyKay47 Member

AyKay47

Posted
Posted

Try this

 

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Week 1 Lab</title>
</head>
<body>
<?php
if (isset($_POST['btn_submit']))	{
$number_of_rows = $_POST['number_of_rows'];
echo "<table cellpadding='10' cellspacing='10' border='1'";
echo "<tr>";
for($ii = 0; $ii < $number_of_rows; $ii++)		{
	echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)		{
		$my_no = mt_rand(1, 100);
		$average_calc[]=$my_no;
		if (($my_no%2==0)&&($my_no%3==0)) {
			$color="#FF00FF";
		}
		else if ($my_no%2==0) {
			$color="#0000FF";
		}
		else if ($my_no%3==0) {
			$color="#FF0000";
		}
		else 
		{	
			$color ="#FFFFFF";	
		}				
		echo "<td style=\"background: {$color};\">$my_no</td>";
	}
	echo "</tr>";
}
echo "</table>";
}

$total=array_sum($average_calc);
$count=count($average_calc);
$average=$total/$count;

?>	
<form name="lab1" method="post" action="">
<input type="textbox" name="number_of_rows" value="5" />
<input type="submit" name="btn_submit" value="Generate Grid" />
<?php
echo $average;
?>
</form>
</body>
</html>

 

I've added in

 

line 16 to create an array

 

Lines 37 - 39 to calculate the average

 

Lines 45 - 47 to print on screen

should work but is more work than needs to be done here

AyKay47 Member

AyKay47

Posted
Posted

No need to put it in an array.

 

$sum = 0;

for($i = 0; $i < $countRows; $i++){
     $sum += mt_rand(1,100);
     // other code...
}

$avg = $sum/$countRows;

same code I posted

 

Your code would throw an undefined variable.

and where would the undefined variable be?

AyKay47 Member

AyKay47

Posted
Posted

should work but is more work than needs to be done here

 

There's no "should" should about it.

 

It does work lol

right but for someone that is new to PHP, dealing with arrays and array functions might not be the best approach here...it's important that he understands what he is doing instead of simply copy pasting code...but yes your code w :-*ill work too...

marcus Regular Member

marcus

Posted
Posted

$total is never defined before you try incrementing it.

sure it is

 

$total += $my_no;

 

right there..

 

OP 

print "The average is: $average";

 

I think you should go back to the basics. You're trying to update a variable that has never been defined before. $total needs to be instantiated before you can start throwing things at it.

 

$total = 0; // this would be instantiating it

AyKay47 Member

AyKay47

Posted
Posted

$total is never defined before you try incrementing it.

sure it is

 

$total += $my_no;

 

right there..

 

OP 

print "The average is: $average";

 

I think you should go back to the basics. You're trying to update a variable that has never been defined before. $total needs to be instantiated before you can start throwing things at it.

 

$total = 0; // this would be instantiating it

right you are, I don't need to go back to basics..human error

This thread is more than a year old. Please don't revive it unless you have something important to add.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.