How to add two large fractions in PHP

Question

I want to add following numbers

$res = 0.000000002 + 0.000000002 + 0.000000002;

I got result like this

4.2E-8

can any one explain , how to get 0.000000006

thanks

If you want `0.000000006` as result, you should get `6.0E-9`. `4.2E-8` means `0.000000042` — dev-null-dweller, Jun 22 '13 at 09:21
I used printf( 0.000000002 + 0.000000002 + 0.000000002); result is same, i want to show exact result like 0.000000006 — dewshare, Jun 22 '13 at 09:24
You shouldn't have got the same result if you used `printf( 0.000000002 + 0.000000002 + 0.000000002);`; if anything, you should have got a warning.... printf() requires a format mask as the first argument — Mark Baker, Jun 22 '13 at 09:35

score 2 · Answer 1 · answered Jun 22 '13 at 09:24

2

You should get the following result:

echo 0.000000002 + 0.000000002 + 0.000000002;

6.0E-9

Which means you haven't told us the truth.

One way to get 4.2E-8 is to add 0.00000002 + 0.00000002 + 0.000000002; (I removed a zero from two of them).

answered Jun 22 '13 at 09:24

Karoly Horvath

94,607
11
117
176

+ Not the solution but valid point – Baba Jun 22 '13 at 09:28

score 2 · Answer 2 · answered Jun 22 '13 at 09:25

2

//Try using 
echo number_format($res,10);

answered Jun 22 '13 at 09:25

Swapnil

592
3
13

score 2 · Answer 3 · answered Jun 22 '13 at 09:25

2

Try

$res = 0.000000002 + 0.000000002 + 0.000000002;
printf("%0.9f",$res);

or

print(number_format($res,9));

Output

0.000000006

answered Jun 22 '13 at 09:25

Baba

94,024
28
166
217

score 0 · Answer 4 · answered Jun 22 '13 at 09:38

0

Please try this .

$res = 0.000000002 + 0.000000002 + 0.000000002;

    echo number_format($res, 9, '.', '');die;

here 9 no is describe after dot how many digit you want to show.

answered Jun 22 '13 at 09:38

Hardik Patel

706
5
14

your code is correct ! but value 9 does not remain the same all time, is any way to replace number 9 to a variable – dewshare Jun 22 '13 at 09:48

score -1 · Answer 5 · edited Feb 11 '14 at 21:22

$res = 0.0000000002 + 0.0000000002 + 0.0000000002;
    echo exp2dec($res);

    function exp2dec($number) {
            preg_match('/(.*)E-(.*)/', str_replace(".", "", $number), $matches);
            $num = "0.";
            while ($matches[2] > 0) {
                    $num .= "0";
                    $matches[2]--;
            }
            return $num . $matches[1];
    }

    die;

Please try this.

How to add two large fractions in PHP

5 Answers5

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