Problem

a. Create a TicTacToe game. In this game, two players alternate placing Xs and Os into a grid until one player has three matching symbols in a row, either horizontally, vertically, or diagonally. Create a game that displays a three-by-three grid containing the digits 1 through 9, similar to the first window shown in Figure 8-15. When the user chooses a position by typing a number, place an X in the appropriate spot. For example, after the user chooses 3, the screen looks like the second window in Figure 8-15. Generate a random number for the position where the computer will place an O. Do not allow the player or the computer to place a symbol where one has already been placed. When either the player or computer has three symbols in a row, declare a winner. If all positions have been used and no one has three symbols in a row, declare a tie.

b. In the TicTacToe game, the computer's selection is chosen randomly. Improve the game so that when the computer has two O_s in any row, column, or diagonal, it selects the winning position for its next move rather than selecting a position randomly.