Creating an Age Calculator

[Nisheeth]

I am a beginner in C++ programming.

I was trying to make an Age Calculator.

It works on the basis that the user will enter the date, his birth year, birth month and birth date.
I wanted to know that is there a method that will automatically take only the System Date and Month (i.e. if today is 10/05/2011, it will take the value of 10 and put it in place of current date [variable] and put 5 in place of the current month[variable])?

I am sorry if this has been asked before, though I couldn't find it anywhere.

Thanks in advance.

[ceruleus]

Have you tried yet? People will be much more willing to help if you post some code. For now, check out Parsing strings and regular expressions.

[packetpirate]

If you want to parse a string such as "10/05/2011", look up the StringTokenizer in the string header file and use the delimiter "/".

[Nisheeth]

I made a basic structure, but the code was too long. I decided to not post it until someone asked for it.
Here is the whole code:

//Variables:
	unsigned int month;			//The User's month input
	unsigned int year;			//The User's year input
	unsigned int date;			//Today's Date - User Input
	
	unsigned int cur_month = 4;	//The Calculative month
	unsigned int cur_year;		//The Calculative year
	unsigned int cur_date;		//User's Input -  Today's date

	unsigned int dates;			//User Date (for Week)

	unsigned int year_age;		//The User's Age in Years
	unsigned int month_age;		//The Month's passed since user's last birthday
	unsigned int date_age;		//User Age Days
	unsigned int week_age;		//User Ag - Week

	unsigned int days = 0;	//Days to User's next Bithday

	int months [12] = {31 , 28  , 31  , 30  , 31  , 30  , 31  , 31  , 30  , 31  , 30  , 31};

	char e = 'N';			//To disable Auto Terminate
	char h = 'N';			//Also to disable Auto Terminate

	//Asking for input:
		
	
		//Current Date
		do
		{
		cout << "Please Enter TODAY's Date and press ENTER/RETURN" << endl;
		cin >> cur_date;
		cout << endl << endl;
		
			//If Flaw:
			if (0 >= cur_date, cur_date >= 31)
			{
				cout << "The Value you enterred was Invalid. Please Enter the correct Value" << endl << endl;
			}
		} while (0 >= cur_date, cur_date >= 31);

		//User Year
		do
		{
		cout << "Please enter the YEAR you were born in and press ENTER/RETURN:" << endl;
		cin >> year;
		cout << endl << endl;
		
			//If flaw	
			if (0 >= year, year >=2011)
			{ 
				cout << "The Value you enterred was Invalid. Please Enter the correct Value" << endl << endl;
			}
		} while (0 >= year, year >= 2011);

		//User Month
		do
		{
		cout << "Please enter the MONTH you were born in NUMERIC FORM and press ENTER/RETURN" <<endl << "[i.e.January is 1, February is 2 and so on]:" << endl;
		cin >> month;
		cout << endl << endl;
		
			//If flaw	
			if (0 >= month, month >= 12 )
			{ 
				cout << "The Value you enterred was Invalid. Please Enter the correct Value" << endl << endl;
			}
		} while (0 >= month, month >= 2010);	

		//User Date
		do
		{
		cout << "Please enter the DATE you were born in and press ENTER/RETURN:" << endl;
		cin >> date;
		cout << endl << endl;
		
			//If flaw	
			if (0 >= date, date >= 31 )
			{ 
				cout << "The Value you enterred was Invalid. Please Enter the correct Value" << endl << endl;
			}
		} while (0 >= date, date >= 2010);

	//Putting up the conditions:
	
	if (month >= 4)
	{
		cur_year = 2010;
	}

	else
		cur_year = 2011;

	
	//Making Equations:
		//Current Age - Years:
		year_age = cur_year - year;
		
		//Current Age - Months:
		if (cur_year == 2010)
		{
			month_age = ((12 - month) + cur_month - 1);
		}

		else 
		{
			month_age = cur_month - month - 1;
		}
		
		//Current Age - Dates:
			
				//Dates Calculation
				dates = ((31 - date) + cur_date);

		//Current Age - Weeks:
				week_age = (dates)/7;

		//Current Date_Age:
				date_age = dates % 7;
				
		//Next Birthday:
			
			//Defining and Calculating Days:
			switch (month)
			{
			case 1: 
				days = (months[0] - month) + months[11] + months[10] + months[9] + months[8] + months[7] + months[6] +  
							months[5] + months[4] + (months[3] - cur_date);
				break;
			case 2: 
				days = (months[1] - month) + months[11] + months[10] + months[9] + months[8] + months[7] + months[6] +  
							months[5] + months[4] + (months[3] - cur_date) + months [2];
				break;
			case 3: 
				days = (months[2] - month) + months[11] + months[10] + months[9] + months[8] + months[7] + months[6] +  
							months[5] + months[4] + months[3]  + months[2];
				break;
			case 4: 
				days = (months[3] - month) + months[11] + months[10] + months[9] + months[8] + months[7] + months[6] +  
							months[5] + months[4] + (months[3] - cur_date);
				break;
			case 5: 
				days = (months[3] - cur_date) +  date;
				break;
			case 6: 
				days = (months[3] - cur_date) +  date + months[4];
				break;
			case 7: 
				days = (months[3] - cur_date) +  date + months[5] + months[4];
				break;
			case 8: 
				days = (months[3] - cur_date) +  date + months[4] + months[5] + months[6];
				break;
			case 9: 
				days = (months[3] - cur_date) +  date + months[4] + months[5] + months[6] + months[7];
				break;
			case 10:
				days = (months[3] - cur_date) + date + months[4] + months[5] + months[6] + months[7] + months[8];
				break;
			case 11:
				days = (months[3] - cur_date) + date + months[4] + months[5] + months[6] + months[7] + months[8] + months[9];
				break;
			case 12: 
				days = (months[3] - cur_date) + date + months[4] + months[5] + months[6] + months[7] + months[8] + months[10];
				break;
			}

//Giving the Age
	cout << "You are "<< year_age << " years, " << month_age << " months, "<< week_age << " weeks and " << date_age << " days old." << endl << endl;
	
	//Next Birthday
	cout << "Your next BIRTHDAY is after " << days << " days." << endl << endl;

	//Thanking Words
	cout << "--------------------------------------------------------------------------------";

	cout << "Thank You for using Age Calculator" << endl << endl;
	cout << "Made by:" << endl << "Nisheeth Pandey" << endl << endl ;
	
	cout << "--------------------------------------------------------------------------------";
	
	// Preventing Auto Terminate with Option to Exit or Not
	
	do
	{	
		cout <<endl << "EXIT (Y or N):";
		cin >> e;
				
				//Declaring h
				if (e == 'Y')
					h = 'Y';
				else if (e == 'y')
					h = 'y';
				//Definfing possibilities
			
				switch(e)
			{
			case 'Y': cout << endl << "You chose to EXIT the program" << endl;
				break;
			case 'y': cout << endl << "You chose to EXIT the program" << endl;
				break;
			case 'N': cout << endl << "You chose not to exit the program. If you want to calculate another age, please restart the AGE CALCULATOR" << endl;
				break;
			case 'n': cout << endl << "You chose not to exit the program. If you want to calculate another age, please restart the AGE CALCULATOR" << endl;
				break;
			default : cout << endl << "The value you enterred was neither ‘Y’ nor ‘N’. Please chose a value between ‘Y’ and ‘N’." << endl;
				break;						
			};
	} 	while (e != h);

[king214]

It might just be better to not over think it, and ask for the user to input the year and date...

EDIT: Although if you just want to gain some experiance than string parsing might be your solution

[Nisheeth]

Well, O.K. I will look up String parser. Thanks anyway.

[tianversion]

too long

[buffbill]

You could do this more simply by converting the calender dates to Julian days....then subtracting to get age in days (or years by taking 365.24 days per year.)