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7-1.

$a + $b $a $b.
$a - $b $b $a.
$a * $b $a $b.
$a / $b $a $b.
$a % $b $a $b.

("/") ( ) - ( ). , .

B -- (".").

$a = "Hello ";$b = $a. "World!"; // $b = "Hello World!"

"=". ""("equal to"). . ( ).

. "$a = 3", 3. :

$a = ($b = 4) + 5; // $a 9, $b 4.

" ", , . :

$a = 3; $a += 5; // $a 8, : $a = $a + 5;
$b = "Hello ";
$b.= "There!"; // $b "Hello There!", $b = $b. "There!";

( )

.

Table 7-2.

$a & $b , $a $b. * : $a=5; /* 0101 */ $b=12; /* 1100 */ $c=$a & $b; /* $c 4 (0100) */
$a | $b , $a $b. * : $a=5; /* 0101 */ $b=12; /* 1100 */ $c=$a|$b; /* $c (1101) */
~ $a _ $a () * : $a=5; /* 0101 */ ~ $a /* $a x (1010) */

7-3.

$a and $b , $a $b.
$a or $b , $a $b.
$a xor $b , $a $b, .
! $a , $a.
$a && $b , $a $b.
$a || $b , $a $b.

"and" "or" - . (. )





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