%{
#include <stdio.h>
a = 10 + 20;
%}
 
%%
 
[0-9]+            { printf("NUMBER: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]*   { printf("IDENTIFIER: %s\n", yytext); }
[+\-*/]           { printf("OPERATOR: %s\n", yytext); }
[\t\n\r ]+        { /* Ignore whitespace */ }
.                 { printf("UNKNOWN CHARACTER: %s\n", yytext); }
 
%%
 
int main() {
    yylex();  // Calls the lexical analyzer
    return 0;
}
 
int yywrap() {
    return 1;  // Indicates end of input
}
 

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