附录B：运算符

+    sum                    integers, floats, strings
-    difference             integers, floats 
*    product                integers, floats 
/    quotient               integers, floats 
%    remainder              integers
&    bitwise AND            integers
|    bitwise OR             integers
^    bitwise XOR            integers
<<   left shift             integer << unsigned integer
>>   right shift            integer >> unsigned integer 
Precedence    Operator
    5             *  /  %  <<  >>  & 
    4             +  -  |  ^
    3             ==  !=  <  <=  >  >=
    2             &&
    1             || 
Assignment Operators 
+=   -=   *=   /=   %=
&=   |=   ^=
>>=  <<=