%{
#include <stdio.h>
%}
 
// Define regular expressions for different types of tokens
datatype      int|float|double|string|char
identifier    [a-zA-Z_][a-zA-Z0-9_]*
number        [0-9]+
string        \"([^\\\"]|\\.)*\"
character     '[^']'
operator      \+|\-|\*|\/|\%|\=\=  // Operators (+, -, *, /, %, ==)
 
%%
 
// Action rules for handling tokens
 
// Match datatypes
{datatype}        { printf("This is a datatype: %s\n", yytext()); }
 
// Match identifiers
{identifier}      { printf("This is an identifier: %s\n", yytext()); }
 
// Match numbers
{number}          { printf("This is a number: %s\n", yytext()); }
 
// Match strings
{string}          { printf("This is a string: %s\n", yytext()); }
 
// Match characters
{character}       { printf("This is a character: %s\n", yytext()); }
 
// Match operators
{operator}        { printf("This is an operator: %s\n", yytext()); }
 
// Ignore spaces, tabs, and newlines
[ \t\n\r]+        { /* Ignore whitespaces */ }
 
// Catch all unmatched characters
.                 { printf("Unknown token: %s\n", yytext()); }
%%
 
int main() {
    // Start the Lex scanner
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;  // End of input
}
 

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