[SOLVED] Few probs with BMI calculator

[darkfreaks]

ok when your first see it it says division by zero on line 14

 

 

which is

 

 

<?php  $total=$weight/$heightwo *703; ?>

 

 

also when it divides i get something like  "Your  Body Mass Index is 9097.64705882%"

 

i want to format the number so the dot is the second digit to the left like  00.00%

[darkfreaks]

okay i fixed the division by zero problem does anyone know how i would use the format_number function to make it 00.00% ?

[darkfreaks]

can i even do this with this function? ???

[darkfreaks]

is there a way i can return the total and if it returns 0.000000% it converts it to 00%  ???

[AndyB]

http://ca.php.net/manual/en/function.sprintf.php

[darkfreaks]

ok so now i got

 

 

sprintf ('01.2f',$total); and it just displays blank? ???

[darkfreaks]

could someone paste aan example as how i would do it via sprintf?

[trq]

If you want it echo'd at the same time you need to use printf().

 

printf ('%01.2f',$total);

[darkfreaks]

now i get 2166.00% how would i make it so it is like 00.00%

[AndyB]

now i get 2166.00% how would i make it so it is like 00.00%

 

Do you mean how would you get that example value to display as 21.66%?

 

If so, try the old divide by 100 trick.

[darkfreaks]

my entire code is below i want it to calculate Body Mass Index Formula if someone can look one up and see if i have done my math correctly?

 

<?php 

$height= trim($_POST['height']);

$weight=trim($_POST['weight']);
$height=str_replace(',','',$height);
$height=str_replace('.','',$height);
$height=strip_tags($height);
$weight=strip_tags($weight);
$weight=str_replace(',','',$weight);
$weight=str_replace('.','',$weight);






if ($_POST['height']||$_POST['weight']=="true") 
{ 
$weighttwo=$weight*100;	

$total=$weighttwo/$height;}




if($_POST['weight']=="") {$error['weight']="Please enter a weight!";} else {unset($error['weight']);} 

if($_POST['height']=="") {$error['height']="Please enter a height!";} else {unset($error['height']);} 


if($error) {?>

<form method="POST">

<b>Height(inches):</b><input name="height" type="text" size="3"><?php if ($_POST) { echo $error['height'];} ?><b>Weight(lbs.):</b><input name="weight" type="text" size="3"><?php if ($_POST) { echo $error['weight'];} ?>
<input type="submit" name="Calculate!" value="Calculate!">

</form>

<?php } else{echo "Your Mass Body Index is"; echo $total; echo "%"; 


} ?>

[darkfreaks]

nvm the formula is all messed up its sposed to be

 

 

$weight/$height*$height*703

[darkfreaks]

now i get

 

Your Mass Body Index is160284%

 

i think im still doing something wrong the forumula is

 

BMI = ( Weight in Pounds / ( Height in inches ) x ( Height in inches ) ) x 703

 

[AndyB]

I suspect the real formula is:

 

BMI = (weight in pounds * 703) / (height in inches * height in inches)

[darkfreaks]

ok so i put $bmi= ($weight*703)/($height*2);

 

and now its getting abit morre realistic i get  your BMi is 1083%

 

i want to knock it down to a 2 digit whole  so its like

 

1-50 percent

 

and even then i dont think its adding up right or something because it would be 10.83 percent and at my current weight and height it should come out to 29.9 percent

 

 

[AndyB]

No, not height times two. height * height.  Basic math 

[darkfreaks]

ok its working now my fault now i get 29.2712345 how do i get rid of the .stuff?

[Barand]

printf();

 

[darkfreaks]

ok so i did printf($total); and i still see no diff?

[AndyB]

Try again. Take a few minutes to re-read the useful contributions in this thread. Take a deep breath. All the help you need is in this thread.

[darkfreaks]

thanks to you all this thread will be closed in 2 seconds

[neylitalo]

ok so i put $bmi= ($weight*703)/($height*2);

 

and now its getting abit morre realistic i get  your BMi is 1083%

 

i want to knock it down to a 2 digit whole  so its like

 

1-50 percent

 

and even then i dont think its adding up right or something because it would be 10.83 percent and at my current weight and height it should come out to 29.9 percent

 

 

 

If you'll notice, AndyB didn't say "height * 2", he said "height * height". There's a rather significant difference there.

[Barand]

If you'll notice, AndyB didn't say "height * 2", he said "height * height". There's a rather significant difference there.

 

Only if height != 2