論理和・論理積・排他的論理和

明解Ｃ言語入門編 > 7. 基本型 >

PHP

<?php
function count_bits($x)
{
    $count = 0;
    while ($x)
    {
        if ($x & 1) $count++;
        $x = ($x >> 1) & ~(~0 << (PHP_INT_SIZE * 8) - 1);
    }
    return $count;
}

function int_bits()
{
return count_bits(~0);

    return count_bits(~0);
}

function print_bits($x)
{
    for ($i = int_bits() - 1; $i >= 0; $i--)
    {
        print ((($x >> $i) & 1) ? '1' : '0');
    }

    print "\n";
}

$na = 12345;
$nb = 54321;

print "A       = ";  print_bits($na);
print "NOT A   = ";  print_bits(~$na);
print "\n";

print "A       = ";  print_bits($na);
print "B       = ";  print_bits($nb);
print "A AND B = ";  print_bits($na & $nb);
print "\n";

print "A       = ";  print_bits($na);
print "B       = ";  print_bits($nb);
print "A OR B  = ";  print_bits($na | $nb);
print "\n";

print "A       = ";  print_bits($na);
print "B       = ";  print_bits($nb);
print "A XOR B = ";  print_bits($na ^ $nb);
?>

実行結果

L:\>php lesson_07_056.php
A = 00000000000000000011000000111001
NOT A = 11111111111111111100111111000110

A = 00000000000000000011000000111001
B = 00000000000000001101010000110001
A AND B = 00000000000000000001000000110001

A = 00000000000000000011000000111001
B = 00000000000000001101010000110001
A OR B = 00000000000000001111010000111001

A = 00000000000000000011000000111001
B = 00000000000000001101010000110001
A XOR B = 00000000000000001110010000001000