%{ 
// Declarations section: You can declare variables, include header files, etc.
#include <stdio.h>
%}
 
%% 
// Rules section: Specify your patterns and corresponding actions.
 
[0-9]+              { printf("Number: %s\n", yytext); } 
[a-zA-Z_][a-zA-Z0-9_]*   { printf("Identifier: %s\n", yytext); }
\n                  { /* ignore newlines */ }
[ \t]+              { /* ignore whitespace */ }
.                   { printf("Unknown character: %s\n", yytext); }
 
%% 
// Code section: The main function and other C code go here.
 
int main(void) {
    yylex(); // Calls the lexical analyzer
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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