%{
#include <stdio.h>
%}
 
%%
 
[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]+                    ;   // Ignore whitespace
.                           { printf("UNKNOWN: %s\n", yytext); }
 
%%
 
int yywrap() { return 1; }
 
int main() {
    printf("Enter input: ");
    yylex();
    return 0;
}
 

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