PHP/Scripting polling

[nick-8318]

You know those popular polls on all these hip hop websites, right? What do the professional scripters do about making sure the results add up to 100%?

Example 1:
Question 1: 3 votes, 33%
Question 2: 3 votes, 33%
Question 3: 3 votes, 33%
Total % = 99%

Example 2:
Question 1: 50 votes, 50%
Question 2: 30 votes, 30%
Question 3: 20 votes, 20%
Total % = 100%

What do they do to make sure they add up to 100? I don't wan't to add/subtract a percentage point to something to make it equal 100. Do I just leave it as 99 or what?

 

[deadserious]

What you would do is divide each result by the total number of votes. Here's a basic example to give you an idea of how you could do it with PHP.

<?php

// Calculating Poll Results Example

// Imagine each option has a certain number of votes.
$option1 = 20;
$option2 = 30;
$option3 = 87;

$totalvotes = $option1+$option2+$option3;

$percent1 = round($option1 / $totalvotes * 100, 2);
$percent2 = round($option2 / $totalvotes * 100, 2);
$percent3 = round($option3 / $totalvotes * 100, 2);

?>
Results:<br />
Option 1: <?=$percent1?>%<br />
Option 2: <?=$percent2?>%<br />
Option 3: <?=$percent3?>%<br />

Total votes:<br />
<?=$totalvotes?>