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gmp_div_q> <gmp_cmp
[edit] Last updated: Fri, 23 Mar 2012

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gmp_com

(PHP 4 >= 4.0.4, PHP 5)

gmp_comCalculates one's complement

Açıklama

resource gmp_com ( resource $a )

Returns the one's complement of a.

Değiştirgeler

a

Ya resource türünde bir GMP sayısı ya da sonradan bir sayıyı dönüştürülmesi mümkün bir sayısal dizge olabilir.

Dönen Değerler

Returns the one's complement of a, as a GMP number.

Örnekler

Örnek 1 gmp_com() example

<?php
$com 
gmp_com("1234");
echo 
gmp_strval($com) . "\n";
?>

Yukarıdaki örneğin çıktısı:

-1235


add a note add a note User Contributed Notes gmp_com
xo at jdbartlett dot com 13-Apr-2010 10:07
If you're using one's compliment (bitwise NOT) to flip all $a's bits, don't forget that you need to use a mask to specify how many bits you expect in your result:

<?php gmp_and(gmp_com('1234'), '2047') ?>
>> 813 // 01100101101 in binary

I chose 2047 because 1234 is an 11-bit binary number and 2047 is the maximum an 11-bit register can hold:

11111111111  (2047)
10011010010  (1234)
01100101101  (813)

 
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