%{
#include<stdio.h>
%}
 
%%
auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|union|unsigned|void|volatile|while {printf("%s is a keyword\n",yytext);}
[+*/=<>^-] {printf("%s is a operator\n",yytext);}
[a-zA-Z_][a-zA-Z0-9_]* {printf("%s is an identifier\n",yytext);}
[0-9]+ {printf("%s is a number\n",yytext);}
 [a-zA-Z_0-9!@#$&]+ {printf("%s is an text\n",yytext);}
[,:;(){}?!|&`~'"] {printf("%s is a punctuation\n",yytext);}
 
[\t|\n];
%%
 
int main()                                                                                                                          
{
    printf("Enter string: ");
    yylex();
}
 
int yywrap()
{
    return 1;
}
 

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