Validation of user input ( month/day)

[aLiNuSh]

Shouldn't have spoon fed you...

#include <iostream>
#include <exception>
#include <string>

struct Date {
	unsigned int month;
	unsigned int day;
};

Date GetDateFromString (const std::string& dateString)
{
	Date date = {0, 0};
	char buff[2];	
	
	//	Check for the correct format...
	if (dateString.length() != 5)
		throw ("The date string must be 5 characters long.");

	size_t slashPos = dateString.find_first_of ('/');
	
	if (slashPos == std::string::npos)
		throw ("Error parsing date. No slash was found.");
	else if (slashPos != 2)
		throw ("Error parsing date. The slash is not positioned correctly.");
	
	//	Convert from string to integer
	dateString.copy (buff, 2);
	date.month = atoi (buff);
	if (date.month == 0)
		throw ("Error parsing date. Incorrect number provided for month");
	
	dateString.copy (buff, 2, 3);
	date.day = atoi (buff);
	if (date.day == 0)
		throw ("Error parsing date. Incorrect number provided for day");
	
	return date;
}

int main ()
{
	std::string dateString;
	Date date;
	
	try {
		std::cout << "Please enter the month and day (mm/dd): ";
		std::cin >> dateString;
		
		Date date = GetDateFromString (dateString);
		
		std::cout << "Month: " << date.month << std::endl;
		std::cout << "Day: " << date.day << std::endl;
	}
	catch (const char * exception)
	{
		std::cout << exception << std::endl;
		return -1;		
	}
	
	return 0;
}