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%{
 
#include <stdio.h>
 
%}
 
%%
 
(\"\%d\")|(\"\%c\")|(\"\%s\") 			{printf("%s is a FORMAT SPECIFIER.\n", yytext);}
\"(\\.|[^\\"])*\" 			{printf("%s is a STRING LITERAL.\n", yytext);}
"++"|"--" 			{printf("%s is a UNARY OPERATOR.\n", yytext);}
("|")|("&")|("~")|("^") 			{printf("%s is a BITWISE OPERATOR.\n", yytext);}
("=")|("+")|("-")|("/") 			{printf("%s is an ARITHMETIC OPERATOR.\n", yytext);}
"<"|"<="|">="|">" 			{printf("%s is a RELATIONAL OPERATOR.\n", yytext);}
"&&"|"||"|"!" 			{printf("%s is a LOGICAL OPERATOR.\n", yytext);}
"{" 			{printf("%s is OPENING CURLY BRACE.\n", yytext);}
"}" 			{printf("%s is CLOSING CURLY BRACE.\n", yytext);}
"(" 			{printf("%s is OPENING BRACE.\n", yytext);}
")" 			{printf("%s is CLOSING BRACE.\n", yytext);}
";"|"," 			{printf("%s is a DELIMITER.\n", yytext);}
"main"|"void"|"switch"|"if"|"else"|"for"|"while"|"break"|"continue"|"auto"|"static" 			{printf("%s is a RESERVED KEYWORD.\n", yytext);}
^#[a-z]+ 			{printf("%s is a PREPROCESSOR DIRECTIVE.\n", yytext);}
"<stdio.h>"|"<string.h>"|"<math.h>" 			{printf("%s is a HEADER FILE.\n", yytext);}
"int"|"char"|"float"|"long"|"long long"|"double" 			{printf("%s is a DATATYPE.\n", yytext);}
[0-9]+ 			{printf("%s is an INTEGER NUMBER.\n", yytext);}
[0-9]+"."[0-9]+ 			{printf("%s is a DECIMAL NUMBER.\n", yytext);}
[a-zA-z_][a-zA-z_0-9]* 			{printf("%s is an IDENTIFIER.\n", yytext);}
[ \n\t] 			{}
 
%%
 
int yywrap() {
	return 1;
}
 
int main() {
	FILE *f = fopen("3input.txt", "r");
	yyin = f;
	yylex();
}
 

prog.c:1:1: error: expected identifier or '(' before '%' token
 %{
 ^
prog.c:7:1: error: expected identifier or '(' before '%' token
 %%
 ^
prog.c:9:1: error: stray '\' in program
 (\"\%d\")|(\"\%c\")|(\"\%s\")    {printf("%s is a FORMAT SPECIFIER.\n", yytext);}
 ^
prog.c:9:1: error: stray '\' in program
prog.c:9:70: warning: missing terminating " character
 (\"\%d\")|(\"\%c\")|(\"\%s\")    {printf("%s is a FORMAT SPECIFIER.\n", yytext);}
                                                                      ^
prog.c:9:1: error: missing terminating " character
 (\"\%d\")|(\"\%c\")|(\"\%s\")    {printf("%s is a FORMAT SPECIFIER.\n", yytext);}
 ^
prog.c:10:1: error: stray '\' in program
 \"(\\.|[^\\"])*\"    {printf("%s is a STRING LITERAL.\n", yytext);}
 ^
prog.c:10:1: error: stray '\' in program
prog.c:10:1: error: stray '\' in program
prog.c:10:56: warning: missing terminating " character
 \"(\\.|[^\\"])*\"    {printf("%s is a STRING LITERAL.\n", yytext);}
                                                        ^
prog.c:10:1: error: missing terminating " character
 \"(\\.|[^\\"])*\"    {printf("%s is a STRING LITERAL.\n", yytext);}
 ^
prog.c:12:2: error: expected identifier or '(' before string constant
 ("|")|("&")|("~")|("^")    {printf("%s is a BITWISE OPERATOR.\n", yytext);}
  ^
prog.c:13:2: error: expected identifier or '(' before string constant
 ("=")|("+")|("-")|("/")    {printf("%s is an ARITHMETIC OPERATOR.\n", yytext);}
  ^
prog.c:14:1: error: expected identifier or '(' before string constant
 "<"|"<="|">="|">"    {printf("%s is a RELATIONAL OPERATOR.\n", yytext);}
 ^
prog.c:15:1: error: expected identifier or '(' before string constant
 "&&"|"||"|"!"    {printf("%s is a LOGICAL OPERATOR.\n", yytext);}
 ^
prog.c:16:1: error: expected identifier or '(' before string constant
 "{"    {printf("%s is OPENING CURLY BRACE.\n", yytext);}
 ^
prog.c:17:1: error: expected identifier or '(' before string constant
 "}"    {printf("%s is CLOSING CURLY BRACE.\n", yytext);}
 ^
prog.c:18:1: error: expected identifier or '(' before string constant
 "("    {printf("%s is OPENING BRACE.\n", yytext);}
 ^
prog.c:19:1: error: expected identifier or '(' before string constant
 ")"    {printf("%s is CLOSING BRACE.\n", yytext);}
 ^
prog.c:20:1: error: expected identifier or '(' before string constant
 ";"|","    {printf("%s is a DELIMITER.\n", yytext);}
 ^
prog.c:21:1: error: expected identifier or '(' before string constant
 "main"|"void"|"switch"|"if"|"else"|"for"|"while"|"break"|"continue"|"auto"|"static"    {printf("%s is a RESERVED KEYWORD.\n", yytext);}
 ^
prog.c:22:1: error: expected identifier or '(' before '^' token
 ^#[a-z]+    {printf("%s is a PREPROCESSOR DIRECTIVE.\n", yytext);}
 ^
prog.c:22:2: error: stray '#' in program
 ^#[a-z]+    {printf("%s is a PREPROCESSOR DIRECTIVE.\n", yytext);}
  ^
prog.c:23:1: error: expected identifier or '(' before string constant
 "<stdio.h>"|"<string.h>"|"<math.h>"    {printf("%s is a HEADER FILE.\n", yytext);}
 ^
prog.c:24:1: error: expected identifier or '(' before string constant
 "int"|"char"|"float"|"long"|"long long"|"double"    {printf("%s is a DATATYPE.\n", yytext);}
 ^
prog.c:25:1: error: expected identifier or '(' before '[' token
 [0-9]+    {printf("%s is an INTEGER NUMBER.\n", yytext);}
 ^
prog.c:26:1: error: expected identifier or '(' before '[' token
 [0-9]+"."[0-9]+    {printf("%s is a DECIMAL NUMBER.\n", yytext);}
 ^
prog.c:27:1: error: expected identifier or '(' before '[' token
 [a-zA-z_][a-zA-z_0-9]*    {printf("%s is an IDENTIFIER.\n", yytext);}
 ^
prog.c:28:1: error: expected identifier or '(' before '[' token
 [ \n\t]    {}
 ^
prog.c:28:1: error: stray '\' in program
prog.c:28:1: error: stray '\' in program
prog.c:30:1: error: expected identifier or '(' before '%' token
 %%
 ^
prog.c: In function 'main':
prog.c:37:2: error: unknown type name 'FILE'
  FILE *f = fopen("3input.txt", "r");
  ^
prog.c:37:12: warning: implicit declaration of function 'fopen' [-Wimplicit-function-declaration]
  FILE *f = fopen("3input.txt", "r");
            ^
prog.c:37:12: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
prog.c:38:2: error: 'yyin' undeclared (first use in this function)
  yyin = f;
  ^
prog.c:38:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:39:2: warning: implicit declaration of function 'yylex' [-Wimplicit-function-declaration]
  yylex();
  ^

Standard output is empty