%{
#include <stdio.h>
#include <string.h>
 
int keyword_count = 0;
 
// List of C keywords
char *keywords[] = {
    "auto", "break", "case", "char", "const", "continue", "default",
    "do", "double", "else", "enum", "extern", "float", "for", "goto",
    "if", "int", "long", "register", "return", "short", "signed",
    "sizeof", "static", "struct", "switch", "typedef", "union",
    "unsigned", "void", "volatile", "while"
};
 
int is_keyword(char *word) {
    for (int i = 0; i < sizeof(keywords)/sizeof(keywords[0]); i++) {
        if (strcmp(word, keywords[i]) == 0) {
            return 1;
        }
    }
    return 0;
}
%}
 
%%
 
[a-zA-Z_][a-zA-Z0-9_]*  {
                            if (is_keyword(yytext)) {
                                keyword_count++;
                            }
                        }
 
.                       ; // Ignore all other characters
 
%%
 
int yywrap() {
    return 1;
}
 
int main(int argc, char *argv[]) {
    if (argc > 1) {
        FILE *file = fopen(argv[1], "r");
        if (!file) {
            printf("Could not open file %s\n", argv[1]);
            return 1;
        }
        yyin = file;
    }
 
    yylex();
    printf("Total number of C keywords: %d\n", keyword_count);
    return 0;
}
 
 

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int main() {
    int a = 10;
    float b = 20.5;
    if (a < b) {
        return 0;
    }
}