Is there any library function for this purpose, so I don't do it by hand and risk ending in TDWTF? echo ceil(31497230840470473074370324734723042.6); // Expected result 31497230840470473074370324734723043 // Prints <garbage> ...
Well, i need to do some calculations in PHP script. And i have one expression that behaves wrong. echo 10^(-.01); Outputs 10 echo 1 / (10^(.01)); Outputs 0 echo bcpow('10', '-0.01') . '<br/>'; Outputs 1 echo bcdiv('1', bcpow('10', '0.01')); Outputs 1.000.... I'm using bcscale(100) for BCMath calculations. Excel and Wolfram ...
I'm looking for a way to generate a big random number with PHP, something like: mt_rand($lower, $upper); The closer I've seen is gmp_random() however it doesn't allow me to specify the lower and upper boundaries only the number of bits per limb (which I've no idea what it is). EDIT: Axsuuls answer seems to be pretty close to what I w...
I'm having trouble calculating roots of rather large numbers using bc_math, example: - pow(2, 2) // 4, power correct - pow(4, 0.5) // 2, square root correct - bcpow(2, 2) // 4, power correct - bcpow(4, 0.5) // 1, square root INCORRECT Does anybody knows how I can circumvent this? gmp_pow() also doesn't work. ...
I need to mimic the exact functionality of the ceil(), floor() and round() functions on bcmath numbers, I've already found a very similar question but unfortunately the answer provided isn't good enough for me since it lacks support for negative numbers and the precision argument for the round() function is missing. I was wondering if a...
I'm writing a PHP library that has a Number class that uses the bcmath extension for arbitrary precision. I have two questions: How much slower is bcmath compared to using the built-in int and float types? bcmath has an optional scale argument (that defaults to 3 digits). For an general purpose Number class that anyone could use, wha...
I have two functions for GNU bc in a Bash script. BC_CEIL="define ceil(x) { if (x>0) { if (x%1>0) return x+(1-(x%1)) else return x } else return -1*floor(-1*x) }\n" BC_FLOOR="define floor(x) { if (x>0) return x-(x%1) else return -1*ceil(-1*x) }\n" echo -e "scale=2"$BC_CEIL$BC_FLOOR"ceil(2.5)" | bc Both functions work fine in interacti...
This is the weirdest thing that has ever happened to me sime I am a (PHP) programmer... I have two files, with the following code (proj. euler stuff) that return different outputs. <?php $numbers =<<<eot 2,3 5,2 9,3 4,9 6,3 10,5 eot; $numbers = explode("\n",$numbers); $max = 0; foreach($numbers as $k => $n){ list($base,$expo) = exp...
how to install bcmath module on a server? I tried yum update php-bcmath but it said it found nothing. please advise. ...