int main(int argc, char *argv[])
{
	start_timing();

	FILE *customer_data_file;
	FILE *customer_list_file;
	char customer_data_file_name[100];
	char customer_list_file_name[100];
	CustomerSelection customer_selection;

	if (argc < 6)
		{
		printf("Usage: mailx customer_file min max start end [override]\n");
		exit(1);
		}

	if (argc < 7)
		override = 0;
	else
		override = atoi(argv[6]);

	strcpy(customer_data_file_name,argv[1]);
	strcat(customer_data_file_name,".dat");

	strcpy(customer_list_file_name,argv[1]);
	strcat(customer_list_file_name,".lst");

	customer_data_file = fopen(customer_data_file_name,"rb");

	if (customer_data_file == NULL)
		{
		printf("Cannot open file %s.\n",customer_data_file_name);
		exit(1);
		}

	customer_list_file = fopen(customer_list_file_name,"w");

	if (customer_list_file == NULL)
		{
		printf("Cannot open file %s.\n",customer_list_file_name);
		exit(1);
		}

	setvbuf(customer_list_file, NULL, _IOFBF, 32000);

	customer_selection = initialize(argv[2],argv[3],argv[4],argv[5]);

	process(customer_data_file, customer_list_file, customer_selection);

	terminate(customer_data_file, customer_list_file);

	end_timing();

	return 0;
}