%{
#include <stdio.h>
#include <string.h>
 
#define MAX_KEYWORDS 10
 
// Array of keywords
const char *keywords[] = {
    "if", "else", "while", "for", "return", 
    "int", "float", "char", "void", "break"
};
 
// Function to check if the string is a keyword
int is_keyword(const char *str) {
    for (int i = 0; i < MAX_KEYWORDS; i++) {
        if (strcmp(str, keywords[i]) == 0) {
            return 1; // It's a keyword
        }
    }
    return 0; // It's not a keyword
}
%}
 
%%
 
// Match keywords or identifiers (words starting with a letter or underscore)
[a-zA-Z_][a-zA-Z0-9_]* {
    if (is_keyword(yytext)) {
        printf("'%s' is a keyword.\n", yytext);
    } else {
        printf("'%s' is not a keyword.\n", yytext);
    }
}
 
// Match anything that is not a word
[ \t\n]+  { /* Ignore whitespace */ }
 
.   { /* Ignore any other characters */ }
 
%%
 
int main() {
    // Read input string from the user
    printf("Enter a string: ");
    yylex();  // Run Lex to start processing input
    return 0;
}
 

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