float calculation and output doesnt work

nemo

Hi!

this code should output "250":

echo (100 * 2.5);

in some php pages it works, in others it outputs "200" when it should be "250"

what can i do about it?

thank you!

Weedpacket

Well, to be blunt about this, echo 1002.5 should always output 250. If something else is being output it's not 1002.5.

After all, how likely is it that PHP will have a bug like that?

Shrike

😕

laserlight

Could you give an example of this anomaly?

e.g. some page somewhere

bad76

Originally posted by nemo
echo (100 * 2.5);
in some php pages it works, in others it outputs "200" when it should be "250"
what can i do about it?
[/B]

Maybe any function do a cast, without you know it.
This change your code into "echo (100 * (int)2.5);" and
it will give you 200...

laserlight

hmm... but the example didnt state any variables, or any functions used.

The answer should be clearcut.

Weedpacket

Obviously the code posted is not the code causing the problem. I can't see why one would want to write "echo 100*2.5;" instead of "echo 250;".

nemo

thank you for your replys so far guys(edit: and girls)!

this is the code:

<TD><?php echo $redcount; ?>
	<IMG HEIGHT=" <?php echo ($redcount * 0.8); ?> " SRC="img/Bar_rot.png" WIDTH="30" BORDER="0">
</TD>

and this is the (wrong) output:
<TD>100
<IMG HEIGHT=" 0 " SRC="img/Bar_rot.png" WIDTH="30" BORDER="0">
</TD>

funny: this happens within a function, if i do the same operation in the main program, it works propperly

Shrike

Are you sure that $redcount has a value in that context, it looks like you are just doing echo (0 * 0.8)

nm just read the bit above :

When I run this code:

<?php
$redcount = 100;
?>
<TD><?php echo $redcount; ?> 
    <IMG HEIGHT=" <?php echo ($redcount * 0.8); ?> " SRC="img/Bar_rot.png" WIDTH="30" BORDER="0"> 
</TD>

I get:

<TD>100 
    <IMG HEIGHT=" 80 " SRC="img/Bar_rot.png" WIDTH="30" BORDER="0"> 
</TD>

nemo

lol problem solved

dont ask me why this worked, but it did.

it seems that he couldnt handle "0.8"

this did it(writing 4/5 instead of 0.8):

 
<TD><?php echo $redcount; ?>
<IMG HEIGHT=" <?php echo round($redcount * 4/5); ?> " SRC="img/Bar_rot.png" WIDTH="30" BORDER="0"> 
</TD>

cheers