# (Towers of Hanoi) Every budding computer scientist must grapple with certain classic problems and…

(Towers of Hanoi) Every budding computer scientist must grapple with certain classic problems and the Towers of Hanoi (Fig. 6.20) is one of the most famous. Legend has it that in a temple in the Far East, priests are attempting to move a stack of disks from one peg to another. The initial stack had 64 disks threaded onto one peg and arranged from bottom to top by decreasing size. The priests are attempting to move the stack from this peg to a second peg under the constraints that exactly one disk is moved at a time, and at no time may a larger disk be placed above a smaller disk. A third peg is available for temporarily holding disks. Supposedly, the world will end when the priests complete their task, so there is little incentive for us to facilitate their efforts.

Let us assume that the priests are attempting to move the disks from peg 1 to peg 3. We wish to develop an algorithm that will print the precise sequence of peg-to-peg disk transfers.

If we were to approach this problem with conventional methods, we would find ourselves hopelessly knotted up in managing the disks. However, if we attack the problem with recursion in mind, it becomes tractable. Moving n disks can be viewed in terms of moving only n – 1 disks (and hence, the recursion) as follows:

a) Move n – 1 disks from peg 1 to peg 2, using peg 3 as a temporary holding area.

b) Move the last disk (the largest) from peg 1 to peg 3.

c) Move the n – 1 disks from peg 2 to peg 3, using peg 1 as a temporary holding area.

The process ends when the last task involves moving n = 1 disk (i.e., the base case). This is accomplished by trivially moving the disk without the need for a temporary holding area.

Write a program to solve the Towers of Hanoi problem. Allow the user to enter the number of disks in a TextBox. Use a recursive Tower method with four parameters:

a) The number of disks to be moved

b) The peg on which these disks are threaded initially

c) The peg to which this stack of disks is to be moved

d) The peg to be used as a temporary holding area

Your program should display in a read-only TextBox with scrolling functionality the precise instructions for moving the disks from the starting peg to the destination peg. For example, to move a stack of three disks from peg 1 to peg 3, your program should print the following series of moves:

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