(Game: connect four) Programming Exercise enables two players to play the connect-four game on the console. Rewrite a GUI version for the program, as shown in Figure 1c. The program enables two players to place red and yellow discs in turn. To place a disk, the player needs to click an available cell. An available cell is unoccupied and its downward neighbor is occupied. The program flashes the four winning cells if a player wins and reports no winners if all cells are occupied with no winners.
FIGURE 1 (a–b) Clicking the Solve button highlights the four consecutive numbers in a row, a column, or a diagonal. (c) The program enables two players to play the connect-four game.

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