%{
#include <stdio.h>
%}
 
%%
"int"|"if"|"else"|"while"    { printf("Keyword: %s\n", yytext); }
 
[0-9]+                       { printf("Number: %s\n", yytext); }
 
[a-zA-Z][a-zA-Z0-9]*         { printf("Identifier: %s\n", yytext); }
 
[+\-*/=]                     { printf("Operator: %s\n", yytext); }
 
[;,(){}]                     { printf("Delimiter: %s\n", yytext); }
 
[ \t\n]+                     ;   /* Ignore whitespace */
 
.                            { printf("Invalid: %s\n", yytext); }
%%
 
int yywrap() {
    return 1;
}
 
int main() {
    printf("Enter input:\n");
    yylex();
    return 0;
}
 

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