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 Os in any row, column, or diagonal, it selects the winning position for its next move rather than selecting a position randomly.