Programming

#include <iostream>
#include <cstring>

using namespace std;

int main(int argc, char *argv[])
{
	
	char *start_f;
	char *end_f;
	char *name_f;
	char *out_f;
	
	int verbose_f;
	int help_f;
	int arg;
	
	while((arg = getopt(argc, argv, "s:e:n:o:vh")) != -1)
		
		switch(arg) {
				
			case('s'):
				
				if(*optarg=='1'||*optarg=='2'||*optarg=='3'||*optarg=='4'||*optarg=='5'||*optarg=='6'||*optarg=='7'||*optarg=='8')
					start_f = optarg;
				
				else {
					cout << "ERROR!" << endl;
					return 0; }
				
				break;
				
			case('e'):
				
				if(*optarg=='1'||*optarg=='2'||*optarg=='3'||*optarg=='4'||*optarg=='5'||*optarg=='6'||*optarg=='7'||*optarg=='8')
					end_f = optarg;
				
				else {
					cout << "ERROR!" << endl;
					return 0; }
				
				break;
				
			case('n'):
				
				if(optarg=="billy")
					name_f = optarg;
							
				break;
				
			case('o'):
				
				out_f = optarg;
				
				break;
				
			case('v'):
				
				verbose_f = 1;
				
				break;
				
			case('h'):
				
				help_f = 1;
				cout << "ERROR!" << endl;
				return 0;
				
				break;
			
			default:
				cout << "ERROR!" << endl;
				return 0; }
	
	printf("\nStarting Length = %s    Ending Length = %s    Name = %s   Output File = %s    Verbose = %d\n\n",
		   start_f, end_f, name_f, out_f, verbose_f);
	
	return 0;
	
}

if(optarg=="billy")