calling upon classes in C#

[ShuckyD]

im trying to get the exact context down for being able to call upon a class i made in a C# console app. Our teach wanted us to make a console app then add a class and call it date and then use the main part of the program to run the class "date," i copied the basic stuff i need into the class "date" then i need to call it from the other "window" where the program started.. then i can see my output then work on it form there? does anyone know the context on how to call on a class in C# (console app)

thanks

J.D.

[ShuckyD]

well to sorta elaborate on the first part of my post.... Im back in programming this semester and i have an assignment that i have to do, its working with multiple classes, well we make a class and call on it in the program, i guess class1, but im not sure exactly how to call on it, or really where to start on the program, if i get an inkling as to where to start im pretty sure i could do it from there, i understand what the code is saying and somewhat how to write it, its just that im confused as how to do "error checking" well heres the assignment that i was given:

Modify the date class of (provided) to perform error checking on the initializer values for instance variables month, date, and year. Also provide a method NextDay to increment the day by one. The Date object should always remain in a consistent state. Write a program that tests the NextDay method in a loop that prints the date during each iteration of the loop to illustrate that the NextDay method works correctly. I have to be careful that I make sure my program increments into the next month and into the next year

here is the code that was given to me from the text...

using System;

namespace ex8_4
{
	/// <summary>
	/// Summary description for Date.
	/// </summary>
	public class Date
	{
		private int month; //1-12
		private int day; //1-31 based on month
		private int year; // any  year

		//constructor confirms proper value for month
		//call method CheckDay to confirm proper value for day

		public Date(int theMonth, int theDay, int theYear)
		{
			//validation of month
			if ( theMonth > 0 && theMonth <= 12)
				month = theMonth;
			else
			{
				month = 1;
				Console.WriteLine(
					"Month {0} invalid. Set to month 1.", theMonth);
			}

			year = theYear; // year validation
			day = CheckDay( theDay );

		}  //end of date constructor

		//a utility method to confirm proper day value based on month and year

		private int CheckDay( int testDay)
		{
			int[] daysPerMonth = 
				{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

			//a check to make sure its not a leap year

			if (month == 2 && testDay == 29 &&
				(year % 400 == 0 ||
				(year % 4 == 0 && year % 100 != 0 )))
				return testDay;

			Console.WriteLine(
				"Day {0} invalid. Set to day 1.", testDay);

			return 1;  //leaves object in consistent state
		}

		//returns date string as month/day/year

		public string ToDateString()
		{
			return month + "/" + day + "/" + year;
		}

		//time to add some methods

	}//end class Date
			


		}

so this is a nice foundation for me to start on, although im not sure what to do next, my main part of my console app looks like this:

using System;

namespace ex8_4
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
// what do i write in here???

Date date = new //????
}
}
}


soo yea any suggestions or help would be appreciated, any thoughts would also be great. Im still wondering how/where to write the methods to do the things it wants me to, i think in the date.cs but then how to i word it so that the program calls upon that class.. (getting back to my original ?? )

[Rootstonian]

All your code will belong in the class as functions (appropriately called "methods"). Looks like error checking is in there for month, day and year???

Your "main{}" should probably look like this:

main() {

int i;

Date myDate(12,25,2006);

for(i=0;i<10;i++)

{
myDate.NextDay(); // you write this to increment the day (and month? and year?)
myDate.PrintDate(); // you write this one too (might call existing method to format)

}

}

[ShuckyD]

thanks roots,

well i have my stuff due today and i was already able to figure it out.. What i was having a problem with was understanding how to get the array to work correctly and then how to call from the main class, into the other class i made so that i can get it right... (pretty much formatting issues)

Console.WriteLine("\n"); //courtesy space
Console.WriteLine("Check increment day");
cls_Date Day_Obj=new cls_Date(12,22,1981);
Day_Obj.NextDay();
Console.WriteLine("12-22-1981-Next day={0} ",Day_Obj.ToString());
Console.WriteLine("\n");


thats how i was able to refer to the other class, i was all confused on how to get it to do it, until i asked the teach on monday to show us how we need to format it, he pretty much just sat down an coded it for us.. haha although i had some of it done, i still didnt know how to make em relate...