int
char
float
类型
struct
union
enum
scanf
getchar
gets
I/O
printf
putchar
puts
+ - * / %
&& || !
表达式
> < == !=
?:
if-else
switch-case
语句
for
while
int []
char []
数组
[]
[][]
int *
char *
指针
struct *
fn *
int fn()
char fn()
函数
*fn()