#include "stdafx.h"

#include <iostream>
#include <string>
#include <sstream>

using namespace std;


void doExercise1Solution() 
{
	// Declare 3 variables, for a hard-coded date.
	int day = 3, month = 12, year = 2011;
		
	// Is the date a leap year?
	bool isLeapYear = ((year % 4 == 0) && !(year % 100 == 0)) || (year % 400 == 0);
		
	cout << "Is " << year << " a leap year? " << isLeapYear << endl;
}
	
	
void doExercise2Solution() 
{
	// Declare 3 variables, for a hard-coded date.
	int day = 3, month = 12, year = 2011;
		
	bool isLeapYear = ((year % 4 == 0) && !(year % 100 == 0)) || (year % 400 == 0);
		
	// Is the date valid?
	bool isValid;
		
	if (month < 1 || month > 12) 
	{
		isValid = false;
	} 
	else if (year < 0 || year > 2099) 
	{
		isValid = false;
	} 
	else if (day < 1) 
	{
		isValid = false;
	} 
	else 
	{
		int maxDay;
		switch (month) 
		{
			case 2:	
				maxDay = (isLeapYear) ? 29 : 28;
				break;
					
			case 4:
			case 6:
			case 9:
			case 11:
				maxDay = 30;
				break;
					
			default:
				maxDay = 31;
				break;
		}
			
		isValid = (day <= maxDay);
	}

	cout << day << "/" << month << "/" << year << " is valid? " << isValid << endl;
}
	
	
void doExercise3Solution() 
{
	int day, month, year;
	string response;
		
	do 
	{
		// Get a date from the user.
		cout << "Day: ";
		cin >> day;
			
		cout << "Month: ";
		cin >> month;

		cout << "Year: ";
		cin >> year;

		bool isLeapYear = ((year % 4 == 0) && !(year % 100 == 0)) || (year % 400 == 0);

		bool isValid;
		if (month < 1 || month > 12) 
		{
			isValid = false;
		} 
		else if (year < 0 || year > 2099) 
		{
			isValid = false;
		} 
		else if (day < 1) 
		{
			isValid = false;
		} 
		else 
		{
			int maxDay;
			switch (month) 
			{
			case 2:	
				maxDay = (isLeapYear) ? 29 : 28;
				break;
					
			case 4:
			case 6:
			case 9:
			case 11:
				maxDay = 30;
				break;
					
			default:
				maxDay = 31;
				break;
			}
			isValid = (day <= maxDay);
		}
			
		cout << day << "/" << month << "/" << year << " is valid? " <<  isValid << endl;

		// Ask the user whether he/she wants to enter another date.
		cout << endl << "Enter another date? ";
		cin >> response;
	} 
	while (response == "yes");
		
	cout << "The End." << endl;
}


void doExercise4Solution() 
{
	int day, month, year;
	string response;
	string allValidDates;
		
	do 
	{
		// Get a date from the user.
		cout << "Day: ";
		cin >> day;
			
		cout << "Month: ";
		cin >> month;

		cout << "Year: ";
		cin >> year;

		bool isLeapYear = ((year % 4 == 0) && !(year % 100 == 0)) || (year % 400 == 0);

		bool isValid;
		if (month < 1 || month > 12) 
		{
			isValid = false;
		} 
		else if (year < 0 || year > 2099) 
		{
			isValid = false;
		} 
		else if (day < 1) 
		{
			isValid = false;
		} 
		else 
		{
			int maxDay;
			switch (month) 
			{
			case 2:	
				maxDay = (isLeapYear) ? 29 : 28;
				break;
					
			case 4:
			case 6:
			case 9:
			case 11:
				maxDay = 30;
				break;
					
			default:
				maxDay = 31;
				break;
			}
				
			isValid = (day <= maxDay);
		}
			
		if (!isValid) 
		{
			cout << "Invalid date!";
		} 
		else 
		{
			// Pretty-print the date.
			string monthName;
			switch (month) 
			{
				case 1:  monthName = "January"; 	break;
				case 2:  monthName = "February"; 	break;
				case 3:  monthName = "March"; 		break;
				case 4:  monthName = "April"; 		break;
				case 5:  monthName = "May"; 		break;
				case 6:  monthName = "June"; 		break;
				case 7:  monthName = "July"; 		break;
				case 8:  monthName = "August"; 		break;
				case 9:  monthName = "September"; 	break;
				case 10: monthName = "October"; 	break;
				case 11: monthName = "November"; 	break;
				case 12: monthName = "December"; 	break;
				default: monthName = "Not Known";	break;	// Should never happen
			}

			string suffix;
			switch (day) 
			{
				case 1:  
				case 21:
				case 31:
					suffix = "st";
					break;
						
				case 2:  
				case 22:
					suffix = "nd";
					break;
		
				case 3:  
				case 23:
					suffix = "rd";
					break;
						
				default:
					suffix = "th";
					break;
			}

			stringstream formattedDate;
			formattedDate << day << suffix << " " << monthName << ", " << year << endl;

			// Append formatted date to a string that contains all valid dates.
			allValidDates += formattedDate.str();
			cout << allValidDates << endl;
		}
			
		// Ask the user whether he/she wants to enter another date.
		cout << endl << "Enter another date? " << endl;
		cin >> response;
	} 
	while (response == "yes");
		
	// Output all the valid dates entered by the user.
	cout << "Here are all the valid dates you entered:" << endl;
	cout << allValidDates << endl;
}


void main() 
{
	// doExercise1Solution();
		
	// doExercise2Solution();
		
	// doExercise3Solution();
		
	doExercise4Solution();
}