//Easy mode just randomly selects an empty space to place a game piece.
public bool Easy(GameBoard ticTac, char ch)
{
do
{
randomPosition = rand.Next(ticTac.GameSpaces.Length);
if (char.IsDigit(ticTac.GameSpaces[randomPosition]))
{
PiecePlace.Computer(ticTac.GameSpaces, randomPosition, ch);
return(false);
}
} while (true);
}
static void UserTurn()
{
Console.Write(" {0}'s turn! Enter a space number to place your piece: ", xOrO);
do
{
input = Console.ReadLine();
if (!PiecePlace.Player(gameBoard.GameSpaces, input, xOrO))
{
Console.Write(" {0} is not a valid entry! Try again: ", input);
continue;
}
break;
} while (true);
}
//Difficult mode checks, in-order, horizontal, vertical, and diagonal lines to see if there are two in a row of either 'X' or 'O'. It then places a piece to complete the line.
//Does not differentiate between 'X' and 'O', and uses no real strategy.
public bool Difficult(GameBoard ticTac, char ch)
{
//Checks matches in horizontal spaces
for (int i = 0; i < 7; i += 3)
{
if (ticTac.GameSpaces[i] == ticTac.GameSpaces[i + 1] || ticTac.GameSpaces[i + 1] == ticTac.GameSpaces[i + 2] || ticTac.GameSpaces[i] == ticTac.GameSpaces[i + 2])
{
for (int j = i; j < i + 3; j++)
{
if (char.IsDigit(ticTac.GameSpaces[j]))
{
PiecePlace.Computer(ticTac.GameSpaces, j, ch);
return(false);
}
}
}
}
//checks for matches in vertical spaces
for (int i = 0; i < 3; i += 1)
{
if (ticTac.GameSpaces[i] == ticTac.GameSpaces[i + 3] || ticTac.GameSpaces[i + 3] == ticTac.GameSpaces[i + 6] || ticTac.GameSpaces[i] == ticTac.GameSpaces[i + 6])
{
for (int j = i; j < i + 7; j += 3)
{
if (char.IsDigit(ticTac.GameSpaces[j]))
{
PiecePlace.Computer(ticTac.GameSpaces, j, ch);
return(false);
}
}
}
}
//checks for matches diagonally right
if (ticTac.GameSpaces[0] == ticTac.GameSpaces[4] || ticTac.GameSpaces[4] == ticTac.GameSpaces[8] || ticTac.GameSpaces[0] == ticTac.GameSpaces[8])
{
for (int i = 0; i < 9; i += 4)
{
if (char.IsDigit(ticTac.GameSpaces[i]))
{
PiecePlace.Computer(ticTac.GameSpaces, i, ch);
return(false);
}
}
}
//checks for matches diagonally left
if (ticTac.GameSpaces[2] == ticTac.GameSpaces[4] || ticTac.GameSpaces[4] == ticTac.GameSpaces[6] || ticTac.GameSpaces[2] == ticTac.GameSpaces[6])
{
for (int i = 2; i < 7; i += 2)
{
if (char.IsDigit(ticTac.GameSpaces[i]))
{
PiecePlace.Computer(ticTac.GameSpaces, i, ch);
return(false);
}
}
}
//if none of the above conditions are met, a random piece is placed
Easy(ticTac, ch);
return(false);
}
