Question

如果声明表现得很奇怪。出于某种原因，如果在IF语句中if ( choosePositionX )转到其他告诉用户其他玩家已经进行了移动，则进入下一个if if ( choosePositionO )并打印出那个中的else。如果它在if语句中突然发生并继续向下，那么我怎么能这样做呢？似乎break;不起作用。

基本上，第一个使用后的else中的else将转到第二个if语句中的其他秒。为什么呢？

#include <iostream>
using namespace std;

// Initialize Array to 9 elements.
// Set array elements 1 to 9 to specify locations for placement of X and O.
char ticTacBoard[9] = {'1', '2', '3', '4', '5', '6', '7', '8', '9'};

// gameState will return 1 to 4. #1. Player X has won, #2. Player Y has won, #3. Draw, #4. Game Not Finished.
int gameState = 0;
int choosePositionX = 0;
int choosePositionO = 0;
int totalMoves = 0;

// Functions declared to run game.
// Checks for winners, draw and if game should continue.
int checkGameState (int gameState);
// Takes in users moves.
void makeMove ();
// Resets board when game finished.
void reset ();
// Prints the board to the user.
void printBoard ();


int main()
{
    cout << "Welcome to Tic Tac Toe!" << endl << endl
         << "The goal of Tic Tac Toe is to be the first player to get three in a row on the grid." << endl << endl
         << "Please select 1 through 9 to select placement for your turn."<< endl << endl;

    int gameState = 4;

    printBoard();

    while ( gameState == 4)
    {
        cout << "Player X please choose a position: ";
        cin >> choosePositionX;
        cout << endl;
        makeMove();
        totalMoves = totalMoves + 1;
        printBoard();
        gameState = checkGameState(gameState);
        if (gameState != 4)
        {
            if ( gameState == 1 )
            {
                cout << "Player X has won the game!" << endl << endl;
                break;
            }
            if ( gameState == 2 )
            {
                cout << "Player Y has won the game!" << endl << endl;
                break;
            }
            if ( gameState == 3 )
            {
                cout << "The game is a DRAW!" << endl << endl;
                break;
            }
        }
        cout << "Player O please choose a position: ";
        cin >> choosePositionO;
        cout << endl;
        makeMove();
        totalMoves = totalMoves + 1;
        printBoard();
        gameState = checkGameState(gameState);
        if (gameState != 4)
        {
            if ( gameState == 1 )
            {
                cout << "Player X has won the game!" << endl << endl;
                break;
            }
            if ( gameState == 2 )
            {
                cout << "Player Y has won the game!" << endl << endl;
                break;
            }
            if ( gameState == 3 )
            {
                cout << "The game is a DRAW!" << endl << endl;
                break;
            }
        }
    }

    char playAgain;

    cout << "Would you like to play again? y/n: ";
    cin >> playAgain;
    cout << endl;

    if (playAgain == 'y')
    {
        reset();
    }
    else if (playAgain == 'n')
    {
        cout << endl;
        cout << "Thanks for playing!!";
        return 0;
    }

    return 0;
}

void reset()
{
    for (int i = 0; i < 9; i++)
    {
        ticTacBoard[i] = 49 + i;
    }

    gameState = 0;
    choosePositionX = 0;
    choosePositionO = 0;
    totalMoves = 0;

    main();
}

int checkGameState(int gameState)
{

////////////// CHECK FOR X /////////////////

    // Check Rows
    if(ticTacBoard[0] == 'X' && ticTacBoard[1] == 'X' && ticTacBoard[2] == 'X')
    {
        return 1;
    }
    if(ticTacBoard[3] == 'X' && ticTacBoard[4] == 'X' && ticTacBoard[5] == 'X')
    {
        return 1;
    }
    if(ticTacBoard[6] == 'X' && ticTacBoard[7] == 'X' && ticTacBoard[8] == 'X')
    {
        return 1;
    }

    // Check Columns
    if(ticTacBoard[0] == 'X' && ticTacBoard[3] == 'X' && ticTacBoard[6] == 'X')
    {
        return 1;
    }
    if(ticTacBoard[1] == 'X' && ticTacBoard[4] == 'X' && ticTacBoard[7] == 'X')
    {
        return 1;
    }
    if(ticTacBoard[2] == 'X' && ticTacBoard[5] == 'X' && ticTacBoard[8] == 'X')
    {
        return 1;
    }

    // Check Diagonally
    if(ticTacBoard[0] == 'X' && ticTacBoard[4] == 'X' && ticTacBoard[8] == 'X')
    {
        return 1;
    }
    if(ticTacBoard[2] == 'X' && ticTacBoard[4] == 'X' && ticTacBoard[6] == 'X')
    {
        return 1;
    }

////////////// CHECK FOR O /////////////////

    // Check Rows
    if(ticTacBoard[0] == 'O' && ticTacBoard[1] == 'O' && ticTacBoard[2] == 'O')
    {
        return 2;
    }
    if(ticTacBoard[3] == 'O' && ticTacBoard[4] == 'O' && ticTacBoard[5] == 'O')
    {
        return 2;
    }
    if(ticTacBoard[6] == 'O' && ticTacBoard[7] == 'O' && ticTacBoard[8] == 'O')
    {
        return 2;
    }

    // Check Columns
    if(ticTacBoard[0] == 'O' && ticTacBoard[3] == 'O' && ticTacBoard[6] == 'O')
    {
        return 2;
    }
    if(ticTacBoard[1] == 'O' && ticTacBoard[4] == 'O' && ticTacBoard[7] == 'O')
    {
        return 2;
    }
    if(ticTacBoard[2] == 'O' && ticTacBoard[5] == 'O' && ticTacBoard[8] == 'O')
    {
        return 2;
    }

    // Check Diagonally
    if(ticTacBoard[0] == 'O' && ticTacBoard[4] == 'O' && ticTacBoard[8] == 'O')
    {
        return 2;
    }
    if(ticTacBoard[2] == 'O' && ticTacBoard[4] == 'O' && ticTacBoard[6] == 'O')
    {
        return 2;
    }

    // After 9 moves we call a Draw. Since we should have a winner before that.
    if ( totalMoves >= 9)
    {
        return 3;
    }

    // Otherwise CONTINUE
    else
        return 4;
}

void makeMove()
{
    if (choosePositionX)
    {
        if (ticTacBoard[choosePositionX - 1] != 'X' && ticTacBoard[choosePositionX - 1] != 'O' )
        {
            ticTacBoard[choosePositionX - 1] = 'X';
        }
        else
        {
            cout << "Player O has already made this move" << endl << endl;
            // keep same moves for counter draw
            totalMoves = totalMoves - 1 + 1;
        }
    }

    if (choosePositionO)
    {
        if (ticTacBoard[choosePositionO - 1] != 'X' && ticTacBoard[choosePositionO - 1] != 'O' )
        {
            ticTacBoard[choosePositionO - 1] = 'O';
        }
        else
        {
            cout << "Player X has already made this move" << endl << endl;
            // keep same moves for counter draw
            totalMoves = totalMoves - 1 + 1;
        }
    }
}

void printBoard()
{
    for (int y = 0; y < 3; y++)
    {
        for (int x = 0; x < 3; x++)
        {
            cout << ticTacBoard[3 * y + x] << " ";
        }

        cout << endl;
    }
    cout << endl;
}

Answer 1

您忘记了连接两个else的{{1}}。你需要使用：

if

Answer 2

使用else if：

if (condition1)
{
  if (subcond1) { /* ... */ }
  else { /* ... */ }
}
else if (condition2)
{
  if (subcond2) { /* ... */ }
  else { /* ... */ }
}
else
{
   // ...
}

Answer 3

将第二个if设为else if，如果choosePositionX为真，则不会检查checkPositionO。

看起来你可以只使用一个变量，如果它们是互斥的。或者更好的enum：

enum Player {
    PlayerX
  , PlayerO
};

enum Player choosePosition;

Answer 4

制作第二个if（choosePosition）

    else if(choosePositionO)

然后你可以休息一下

如果声明跳跃

4 个答案: