%{
#include <stdio.h>
#include <string.h>
 
// List of keywords
char *keywords[] = {
    "int", "float", "char", "double", "if", "else",
    "while", "for", "return", "void", "break", "continue"
};
 
int isKeyword(char *word) {
    int i;
    for(i = 0; i < 12; i++) {
        if(strcmp(word, keywords[i]) == 0)
            return 1;
    }
    return 0;
}
%}
 
%%
[a-zA-Z_][a-zA-Z0-9_]* {
    if(isKeyword(yytext))
        printf("%s is a KEYWORD\n", yytext);
    else
        printf("%s is an IDENTIFIER\n", yytext);
}
 
\n      { return 0; }
.       ;
%%
 
int main() {
    printf("Enter a word: ");
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}

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