a lexer for simple C in language C 简易C语言词法分析器 code rule: identification for variable 1 ID const int 2 CINT const real 3 CREAL const char 4 CCHAR const string 5 CSTRING Main 6 MAIN Void 7 VOID int 8 INT Char 9 CHAR Float 10 FLOAT Printf 11 PRINTF Scanf 12 SCANF Else 13 ELSE If 14 IF Return 15 RETURN while 16 WHILE string 17 STRING

• 100 ADD

• 101 SUB

• 102 MUL / 103 DIV = 104 ASSIGN

105 GT < 106 LT <= 107 NGT = 108 NLT % 109 MOD ! 110 NOT && 111 AND || 112 OR == 113 EQUAL & 114 QUOTE | 115 DQUOTE , 150 COMMA ; 151 SEMI ( 152 LBR ) 153 RBR [ 154 LSBR ] 155 RSBR { 156 LBRACE } 157 RBRACE