%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int token_count = 1; // Token number (for the order of tokens)
int line_number = 1; // Line number (for counting lines in input)
 
void print_token(const char *token_type, const char *token_value) {
    // Print the token number, line number, token type, and lexeme
    printf("%-12d %-15d %-15s %s\n", token_count++, line_number, token_type, token_value);
}
%}
 
/* Definitions Section */
%%
"int"|"float"|"char"|"if"|"else" { print_token("KEYWORD", yytext); }
"+"|"-"|"*"|"/"|"=" { print_token("OPERATOR", yytext); }
[0-9]+ { print_token("NUMBER", yytext); }
[a-zA-Z_][a-zA-Z0-9_]* { print_token("IDENTIFIER", yytext); }
[ \t\r]+ ; /* Skip whitespace (spaces, tabs, carriage returns) */
\n { line_number++; } /* Increment line number on newline */
. { print_token("UNKNOWN", yytext); } /* Catch-all rule for unrecognized characters */
%%
 
int yywrap() {
    return 1;
}
 
int main() {
    printf("TOKEN NO LINE NO TOKEN LEXEME\n");
    yylex(); /* Call the lexer */
    return 0;
}

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