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$a=2;
$a=3;
...
print $a.$b   #string operator prints 2 plus the three or 23
print $a*$b   #arithmetic operator prints 6
print $a x $b #string operators prints $a $b times or 2 three times. i
+e 222

$a=3;
$b="x";
...
$a-=2;     #$a=$a-2; $a is now equal to 3;
$b x=3;    #$b=$b x $3 $b is now equal to "xxx";
$b .="33"; #b=$b."33"  $b is now equal to "xxx33";

$a=1;
print $a++; #prints a as one then adds 1 to it
print $a;   #now $a is 2
print ++$a; #adds one to $a and then prints its value which is now 3;
print $a--; #prints 3 then subtracts one from $a;