Why is the output Negative?

Question

Perhaps I am incredibly stupid, but I have no idea why the output is negative?

It is really affecting my program

<?php

$vone =  10833087074.438;


$massone = 1;
$keone = $vone ^ 2;

echo $keone;
echo "<BR>";
$keone = $keone * $massone;
echo $keone;
echo "<BR>";
$keone = .5 * $keone;

echo $keone;

?>

What would you *expect*? I suppose you think `^` means "power of"? (Hint: wrong) — deceze, Aug 11 '14 at 12:39
Thank you for the response, noob mistake I guess I am stupid what is "^" and how do I do exponent instead? — Orca, Aug 11 '14 at 12:40
@Orca [bitwise xor](http://stackoverflow.com/questions/2724936/what-does-mean-in-php) — Kevin L, Aug 11 '14 at 12:47

Hanky Panky · Accepted Answer · 2014-08-11T17:13:17.887

2

Many notations use "^" as a power operator, but in PHP (and other C-based languages) that is actually the XOR operator. You need to use this 'pow' function, there is no power operator.

In your code

$keone = $vone ^ 2;

Should be

$keone = pow($vone,2);

Rest of your code is fine. That pow function is the one you should use to raise your baise to the power given.

edited Aug 11 '14 at 17:13

answered Aug 11 '14 at 12:40

Hanky Panky

46,730
8
72
95

score 0 · Answer 2 · answered Aug 11 '14 at 12:41

0

Use this code

<?php

$vone =  10833087074.438;


$massone = 1;
$keone = pow($vone,2);

echo $keone;
echo "<BR>";
$keone = $keone * $massone;
echo $keone;
echo "<BR>";
$keone = .5 * $keone;

echo $keone;

?>

answered Aug 11 '14 at 12:41

akhilesh

54
5

Why is the output Negative?

2 Answers2