Problem Set 1: Introduction to Visual Studio .NET & C#

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Com S 430 Fall2005 Dr. Markus Lumpe public class Tower { // public constructor public Tower( string aName ); // read-only property that returns the name of the tower public string Name { get; }; // read-only property that returns the number of disks // stored here. public int Count { get; }; // place a disk on top of all other disks. If “aDisk” is // larger than the top-level disk on the tower, write an // error message on the screen (i.e., Console). public void Add( Disk aDisk ); } // remove a disk from the top of the tower public Disk Remove(); public class Priest { } } // The method MoveDisks implements the above algorithm. // The parameter aMoves is used to store strings, which // represent the precise instructions that it will take // to move the disks from the starting peg to the // destination peg. public void MoveDisks( ArrayList aMoves, Tower aStart, Tower aTarget, Tower aTemp ) You may find the classes Stack and ArrayList useful, which are defined in the namespace “System.Collections”. The strings that represent the moves should have the following format: “ ” For example, to move a stack of three disks from peg 1 to peg 3, your program should generate the following series of move strings: “1 --> 3” “1 --> 2” “3 --> 2” “1 --> 3” “2 --> 1” “2 --> 3” “1 --> 3” 4
Com S 430 Fall2005 Dr. Markus Lumpe Problem 4 Implement the console application “TowersOfHanoi.exe” that uses the class library “TowersOfHanoiLib.dll”. In the Main function, create three Tower objects and store an initial number of disks on the first tower by creating the appropriate disk objects and repeatedly calling the first Tower’s Add() method. The application should request a user input (using the methods Console.ReadLine() and Int32.Parse()) to set the initial number of disks. Furthermore, create a Priest object and call the method “MoveDisks”. The first argument is an ArrayList object. After the call of “MoveDisks” the ArrayList object will contain a list of strings that represent the performed moves. Print all strings contained in the ArrayList object using the “foreach” statement. The console application “TowersOfHanoi.exe” should produce the following output: Add the line Console.Read(); as last statement to the Main function. You have to press any key to terminate the application. This might be useful, when debugging the program. 5
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Problem Set 1: Introduction to Visual Studio .NET & C#

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