void, char, int, float, double, short, long, enum, ...
Pointer, Array, Structure, ...
typedef, extern, static, const, ...
Escape sequences: \n, \", \0, ...
Data type constants: 0x7F, 100UL, 1.0E-3, ...
if-else, for, while, switch, return, ...
+,+=,++,--,<<,>>,==,!=,&&,||,&,|,~,->, ...
#include, #define, #ifdef, #if, #else, #endif, ...
stdio.h, stdlib.h, ctype.h, string.h, math.h, ...
printf, scanf, fopen, fclose, atoi, atof, malloc, free, ...