%{
#include <stdio.h>
 
int identifier_count = 0;
%}
 
%%
[a-zA-Z_][a-zA-Z0-9_]*    { 
    identifier_count++; 
}
[ \t\n]+                  { /* Skip whitespace */ }
.                         { /* Ignore everything else */ }
%%
 
int main(int argc, char **argv) {
    if (argc > 1) {
        FILE *file = fopen(argv[1], "r");
        if (!file) {
            perror("Error opening file");
            return 1;
        }
        yyin = file;
    }
 
    yylex();  // Start the lexical analysis
    printf("Number of identifiers: %d\n", identifier_count);
    return 0;
}
 

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