lex/flex errors

%{
 
#define COMMENT		1
#define VARIABLE	2
#define INTEGER		3
#define FLOAT		4
#define STRING		5
#define T_IF		6
#define T_ELSE		7
#define T_WHILE		8
#define T_INT		9
#define T_VOID		10
#define T_RETURN	11
#define T_FLOAT		12
#define PLUS		13
#define MINUS		14
#define TIMES		15
#define SLASH		16
#define LPAREN		17
#define RPAREN		18	
#define SEMICOLON	19
#define COMMA		20
#define EQL			21
#define OR			22
#define OR2			23
#define AND			24
#define AND2		25
#define LITERAL	    26
#define IDENTIFIER	27
 
		
	
		
%}
	
	LETTER          [a-zA-Z_]
	DIGIT           [0-9]
	LETTERDIGIT     [a-zA-Z0-9_]
	SIGN            [-+]
	STRINGCONSTANT  \"[^"\n]*["\n]
    CHARCONSTANT    \'[^'\n]*\'
	RANKSPEC        \[[,]*\]
	INTEGER			{digit}+
	VARIABLE        [a-z_]({LETTERDIGIT})*
    COMMENT			"/*""/"*([^*/]|[^*]"/"|"*"[^/])*"*"*"*/"
							  
    %%
							  
  "+"                  { return PLUS;       }
  "-"                  { return MINUS;      }
  "*"                  { return TIMES;      }
  "/"                  { return SLASH;      }
  "("                  { return LPAREN;     }
  ")"                  { return RPAREN;     }
  ";"                  { return SEMICOLON;  }
  ","                  { return COMMA;      }
  "="                  { return EQL;        }
  "|"                  { return OR;         }
  "||"                 { return OR2;        }
  "&"                  { return AND;        }
  "&&"                 { return AND2;       }
  
  "if"                 { return T_IF;       }
  "else"               { return T_ELSE;     }
  "do"                 { return T_DO;       }
  "int"                { return T_INT;      }
  "return"             { return T_RETURN;   }
  "void"               { return T_VOID;     }
  "float"              { return T_FLOAT;    }
  "while"              { return T_WHILE;   }
  
  
  {LETTER}{LETTERDIGIT}* {
  return(IDENTIFIER);
  }
  
  {VARIABLE}* { 
	  printf("VARIABLE\n"); yylval.lexeme=(char*)malloc(yyleng+1);
	  strcpy(yyval.lexeme, yytext); 
	  /*return T_VARIABLE*/
	  return(LITERAL);
  }
  
  {COMMENT} {
	return(LITERAL);
  }
  
  {SIGN}?{DIGIT}+"."{DIGIT}+ {   
	  printf("FLOAT\n"); sscanf(yytext,"%d", &(yyval.value));
	  return(LITERAL);
  }
  
  {SIGN}?{DIGIT}+ {  
	  printf("INTEGER\n"); sscanf(yytext,"%d", &(yyval.value));
	  return(LITERAL);
  }
  
  {STRINGCONSTANT} {
  return(LITERAL);
  }
  
  
  [ \t\n\r]            /* skip whitespace */
  
  .                    { printf("Unknown character [%c]\n",yytext[0]);
						return UNKNOWN;    }
 
	%%
	
int main(void){
							  int token;
							  while(token = yylex()) {
							  printf("lexed token: %d\n", token);
							  }
}
int yywrap(void){
	return 1;
}

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