Percentages

[Mutley]

This is probably really basic but I can't figure it out.

 

If I have someone who has played 10 times, 8 times he has won and 2 times he has lost.

 

What I want to do is make a % for this (in this case it should be 80%). If I do:

(8/2)*100 = 400%

 

So how do I get it to work the way I want? Basic maths I fail at. 

[jitesh]

If total are 10 then

 

10 --------- 8

100 --------( ? )

 

100*8/10 = 80

[wildteen88]

You'll want to do lost / won and not won / lost

 

((2 / * 100);

[obsidian]

You'll want to do lost / won and not won / lost

 

((2 / * 100);

 

Actually, for a win percentage, you'll want to do won / total played like jitesh said

<?php
$winPct = (($win / $gamesPlayed) * 100);
$losPct = (($loss / $gamesPlayed) * 100);
?>

[Mutley]

Thanks but why can't I divide by zero? I get an error saying I can't divide by zero.

[jitesh]

You can not devide by zero

 

insted of you can keep a if condion like this

if($game_playes == 0){

      $per = 0;

}else{

    make calculations....

}

[Asheeown]

You can never divide by 0.

Take a look at obsidians it's well thought out and dynamic, so those 3 variables: $win, $loss, and $gamesPlayed can all be different and $winPct and $losPct will be populated with your win and loss percentages.

[obsidian]

Once again, like jitesh says, mathematically, you cannot divide by zero. This is not a PHP thing, this is a math thing. Try it out: run calc on your PC and do something like 3 / 0. You'll get the same error message. you've got to account for that in your logic. So, combining the recommendation that jitesh said with my above code, I'd recommend something like this:

<?php
if ($gamesPlayed > 0) {
  $winPct = (($win / $gamesPlayed) * 100);
  $losPct = (($loss / $gamesPlayed) * 100);
} else {
  $winPct = 'n/a';
  $losPct = 'n/a';
}
?>

 

Good luck.

[utexas_pjm]

Combining Obsidian's and Jitesh's solutions yields:

 

<?php
$winPct = (($gamesPlayed == 0) ? 0 : ($win / $gamesPlayed) * 100);
$lossPct = 100 - $winPct;
?>

 

Best,

 

Patrick