main.h

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    int opt;
    int verbose = 0;

    while ((opt = getopt(argc, argv, "hv")) != -1) {
        switch (opt) {
            case 'h':
                printf("Usage: %s [-h] [-v]\n", argv[0]);
                printf("  -h  Display this help and exit\n");
                printf("  -v  Increase verbosity\n");
                exit(EXIT_SUCCESS);
            case 'v':
                verbose = 1;
                break;
            default: /* '?' */
                fprintf(stderr, "Usage: %s [-h] [-v]\n", argv[0]);
                exit(EXIT_FAILURE);
        }
    }

    if (verbose) {
        printf("Verbose mode is on.\n");
    } else {
        printf("Verbose mode is off.\n");
    }

    // Your program's logic goes here

    return EXIT_SUCCESS;
}