%{
#include <stdio.h>
%}
 
%%
[-+]?[0-9]+(\.[0-9]+)?  { printf("Signed Number: %s\n", yytext); }
[0-9]+(\.[0-9]+)?        { printf("Number: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]*   { printf("Identifier: %s\n", yytext); }
[\t\n ]                 { /* Ignore whitespace */ }
.                        { printf("Unknown: %s\n", yytext); }
%%
 
int main() {
    printf("Enter input: ");
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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