int, float, double, char, struct, union, enum, void, typedef
long, short, signed, unsigned,  
const, static, volatile, auto, extern, register 
if, else, do, while, for, goto, switch, case, default 
break, continue,  return
sizeof

if(else)
switch
while, do-while
for 
goto 
break, continue, return

+   -   *   /   % 
>   <   >=  <=   
==   !=
=
~   ^(异或)  |   &    >>   <<  
&&   ||   ！
*   & (取地址)    ->    .（结构成员）    sizeof    ?:
()    []
++   --    
-  负     
,  逗号 
(type)  强制类型转换

+=   -=   *=   /=   %= 
>>=   <<=   &=   ^=   |=