%{
#include<stdio.h>
%}
 
DIGIT [0-9]
ID [_a-zA-Z][a-zA-z0-9]
KEYWORD [if/else/while/int]
OP ">"|"<"|"="|">="|"<="|"+"|"*"|"/"|"-"
SPECIALCHARACTER "'"|";"|":"|","|"("|")"
%%
{KEYWORD}+ {printf("%s is a keyword\n",yytext);}
[0-9]+ {printf("%s is an integer\n",yytext);}
{ID}+ {printf("%s is an identifier\n",yytext);}
{OP}+ {printf("%s is an operator\n",yytext);}
{SPECIALCHARACTER}+ {printf("%s is a special character\n",yytext);}
%%
int main()
{
	extern FILE *yyin;
    	yyin = fopen("t1.txt","r");
   	yylex();
   	fclose(yyin);
 
    return 0;
}
 
int yywrap()
{
	return 1;
}

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