%{
#include<stdio.h>
#include<string.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("Reserved word: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]*    { printf("Identifier: %s\n", yytext); }
.    { /* Ignore all other characters */ }
%%
 
int main() {
    yylex();
    return 0;
}
 

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