Programming

./source/GetVel.cc:122:40: warning: multi-character character constant
./source/GetVel.cc:162:14: warning: multi-character character constant

    static struct option long_options[] = {
        {"cmod", required_argument, 0, 'cmod'},
        {"append", 1, 0, 0},
        {"delete", 1, 0, 0},
        {"verbose", 1, 0, 0},
        {"help", no_argument, 0, 'h'},
        {"file", 1, 0, 0},
        {NULL, 0, NULL, 0}                       // Required at end of array.
    };

    while ((c = getopt_long(argc, argv, "abc:d:012",
                 long_options, &option_index)) != -1) {
        int this_option_optind = optind ? optind : 1;
        switch (c) {
        case 0:
            printf ("option %s", long_options[option_index].name);
            if (optarg)
                printf (" with arg %s", optarg);
            printf ("\n");
            break;
        case 'cmod':
            printf ("option cmod with value '%s'\n", optarg);
            opt_cmod = optarg;
            break;

    // A string listing valid short options letters.
    const char* const short_options = "hv:";

    // An array describing valid long options.
    static struct option long_options[] = {
        {"cmod", required_argument, 0, 10},
        {"vdx",  required_argument, 0, 11},
        {"kx",   required_argument, 0, 12},
        {"vdz",  required_argument, 0, 13},
        {"kz",   required_argument, 0, 14},
        {"idx",  required_argument, 0, 15},
        {"ki",   required_argument, 0, 16},
        {"vel",  required_argument, 0, 17},
        {"velp", required_argument, 0, 18},
        {"vels", required_argument, 0, 19},
        {"intf", required_argument, 0, 20},
        {"lay",  required_argument, 0, 21},
        {"verbose", optional_argument, 0, 22},
        {"help", no_argument, 0, 'h'},
        {NULL, 0, NULL, 0}                       // Required at end of array.
    };

    int option_index = 0;
    while ((c = getopt_long(argc, argv, short_options, long_options, &option_index)) != -1) {
        int this_option_optind = optind ? optind : 1;
        switch (c) {
        case 0:
            printf ("option h number\n");
            printf ("option %s", long_options[option_index].name);
            if (optarg)
                printf (" with arg %s", optarg);
            printf ("\n");
            break;
        case 10:
            printf ("cmod, option 10\n");
            printf ("option cmod with value '%s'\n", optarg);
            break;
        case 11:
            printf ("vdx, option 11\n");
            printf ("option vdx with value '%s'\n", optarg);
            break;
        case 12:
            printf ("kx, option 12\n");
            printf ("option kx with value '%s'\n", optarg);
            break;
        case 13:
            printf ("vdz, option 13\n");
            printf ("option vdz with value '%s'\n", optarg);
            break;
        case 14:
            printf ("kz, option 14\n");
            printf ("option kz with value '%s'\n", optarg);
            break;
        case 15:
            printf ("idx, option 15\n");
            printf ("option idx with value '%s'\n", optarg);
            break;
        case 16:
            printf ("ki, option 16\n");
            printf ("option ki with value '%s'\n", optarg);
            break;
        case 17:
            printf ("vel, option 17\n");
            printf ("option vel with value '%s'\n", optarg);
            break;
        case 18:
            printf ("velp, option 18\n");
            printf ("option velp with value '%s'\n", optarg);
            break;
        case 19:
            printf ("vels, option 19\n");
            printf ("option vels with value '%s'\n", optarg);
            break;
        case 20:
            printf ("intf, option 20\n");
            printf ("option intf with value '%s'\n", optarg);
            break;
        case 21:
            printf ("lay, option 21\n");
            printf ("option lay with value '%s'\n", optarg);
            break;
        case 'a':
            printf ("option a\n");
            aopt = 1;
            break;
        case 'b':
            printf ("option b\n");
            bopt = 1;
            break;
        case 'c':
            printf ("option cmod with value '%s'\n", optarg);
            opt_cmod = optarg;
            break;
        case 'h':
            print_help();
            break;
        case '?':
            break;
        default:
            printf ("?? getopt returned character code 0%o ??\n", c);
        }
    }

    // Process the remaining non-option arguments.
    if (optind < argc) {
        printf ("non-option ARGV-elements: ");
        while (optind < argc)
            printf ("%s ", argv[optind++]);
        printf ("\n");
    }
    exit (0);