%{
#include <stdio.h>
int yywrap();   // function declaration
%}
 
%%
(bool|int|float)                   { printf("Keyword\n"); }
[0-9]+(\.[0-9]+)?                  { printf("Constant\n"); }
[.,;'""]+                          { printf("Punctuation Char\n"); }
[!@#$%^&*()]+                      { printf("Special Char\n"); }
[a-zA-Z_][a-zA-Z0-9_]*             { printf("Identifier\n"); }
[ \t\n]+                           { /* ignore spaces, tabs, and newlines */ }
.                                  { /* ignore any other characters */ }
%%
 
int yywrap() {
    return 1;
}
 
int main() {
    printf("Enter your code (Ctrl+D to stop):\n");
    yylex();   // start lexical analysis
    return 0;
}
 

JXsKI2luY2x1ZGUgPHN0ZGlvLmg+CmludCB5eXdyYXAoKTsgICAvLyBmdW5jdGlvbiBkZWNsYXJhdGlvbgolfQoKJSUKKGJvb2x8aW50fGZsb2F0KSAgICAgICAgICAgICAgICAgICB7IHByaW50ZigiS2V5d29yZFxuIik7IH0KWzAtOV0rKFwuWzAtOV0rKT8gICAgICAgICAgICAgICAgICB7IHByaW50ZigiQ29uc3RhbnRcbiIpOyB9ClsuLDsnIiJdKyAgICAgICAgICAgICAgICAgICAgICAgICAgeyBwcmludGYoIlB1bmN0dWF0aW9uIENoYXJcbiIpOyB9ClshQCMkJV4mKigpXSsgICAgICAgICAgICAgICAgICAgICAgeyBwcmludGYoIlNwZWNpYWwgQ2hhclxuIik7IH0KW2EtekEtWl9dW2EtekEtWjAtOV9dKiAgICAgICAgICAgICB7IHByaW50ZigiSWRlbnRpZmllclxuIik7IH0KWyBcdFxuXSsgICAgICAgICAgICAgICAgICAgICAgICAgICB7IC8qIGlnbm9yZSBzcGFjZXMsIHRhYnMsIGFuZCBuZXdsaW5lcyAqLyB9Ci4gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgeyAvKiBpZ25vcmUgYW55IG90aGVyIGNoYXJhY3RlcnMgKi8gfQolJQoKaW50IHl5d3JhcCgpIHsKICAgIHJldHVybiAxOwp9CgppbnQgbWFpbigpIHsKICAgIHByaW50ZigiRW50ZXIgeW91ciBjb2RlIChDdHJsK0QgdG8gc3RvcCk6XG4iKTsKICAgIHl5bGV4KCk7ICAgLy8gc3RhcnQgbGV4aWNhbCBhbmFseXNpcwogICAgcmV0dXJuIDA7Cn0K