Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trialYu-Che Hung
Courses Plus Student 10,607 PointsPHP Basic - Variables in PHP - final challenge task what's wrong with my answer?
They said I multiplied the wrong number.
<?php
//Place your code below this comment
$integerOne =1;
$integerTwo =2;
$integerOne +=5;
$integerTwo -=1;
$floatOne =1.5;
var_dump($integerOne * $floatOne);
?>
3 Answers
Mike Wagner
23,559 PointsPHP has really nasty floating point precision issues as mentioned here and many other places. This often results in weird results in mathematical operations that result from numbers like 1.5 turning into things like 1.4999999[...]
or 1.5000[...]001
internally. In order to solve things like this, it's often necessary to use a function like round()
link, floor()
link, or something else to artificially create the precision necessary to obtain an expected result.
Jonathan Dewitt
8,101 PointsUse echo
instead of var_dump
.
Yu-Che Hung
Courses Plus Student 10,607 Pointsthanks! apprecaite!!