不合格的id错误和井字棋板不能正常工作

Question

我正在尝试编写一个C++井字棋游戏。但是我不断收到两个错误。 1.在while循环之后的每个我的两个if状态之前，如果出现''，我得到错误“unqualified-id before”。我不知道为什么。 2.当我运行程序时，automaticaly表示无效移动，它不会用x或o来替换板上的空间。请帮助，这里是我的代码：

/* 
Sophia Ali 
    Template for TicTacToe.cpp (CS-509 Assignment 5) 
can't get program to store x and o in the board 
*/ 

#include<iostream> 
#include <cstdlib> 
using namespace std; 

/* 
    Game status enumeration 
*/ 
enum Status { WIN, DRAW, CONTINUE, QUIT }; 

/* 
    Function prototypes 
*/ 
// showBoard: Show current state of board 
void showBoard(const char board[], int boardSize); 
// checkGameState: Returns WIN or CONTINUE 
Status checkGameState(const char board[]); 
int getHumanSquare(const char board[]); 
int getComputerSquare(const char board[]); 
// checkBadSquare: Checks to see if a chosen square is already taken; returns 
//     true if already taken; used by getHumanSquare and 
//     getComputerSquare functions above. 
bool checkBadSquare(const char board[], int squareNum); 
int getrandint(int min, int max); 

int main() 
{ 
    char board[] = "123456789"; // 10 element char board 
    const int boardSize = 10; 
    Status gameState = CONTINUE; 
    int gametype, squareChoice, turnNum = 0; 
    char currentSymbol;   // 'o' or 'x' 

    cout << "\n This is a Tic Tac Toe program. Choose the type of game: " 
     << "\n (1) human o vs. human x (2) human o vs. dumb computer x" 
     << "\n\n -> "; 
    cin >> gametype; 

    /* Show the current state of Tic Tac Toe board. */ 
    cout << gameState; 
    cout << "\n\n"; 

    /* 
     Main game loop 
    */ 
    while (gameState == 2) 
    { 
     /* Increment turnNum by 1. */ 
     turnNum++; 

     /* If turnNum equal to 10 
       Set gameState to DRAW. 
       Break out of while loop. */ 
     if (turnNum == 10) 
     { 
      gameState = DRAW; 
      break; 
     } 
     /* If we are on an odd-numbered turn 
       Print "It's o's turn." 
       Set currentSymbol to 'o'. 
       Call getHumanSquare function to get squareChoice.*/ 
     if (turnNum%2 != 0) 
     { 
      cout << "It's o's turn."; 
      currentSymbol = 'o'; 
      cout << "\n\n"; 

      getHumanSquare(board); 
      showBoard(board, boardSize); 
     } 

     /* Else (we are on an even-numbered turn) 
      Print "It's x's turn." 
      Set currentSymbol to 'x'. */ 
     else 
     { 
      cout << "It's x's turn."; 
      currentSymbol = 'x'; 
      cout << "\n\n"; 
      showBoard(board, boardSize); 

     } 

     /* If the gametype is 1 (human vs. human) 
       Call getHumanSquare function to get squareChoice.*/ 
     if (gametype == 1) 
     { 
      getHumanSquare(board); 
     } 

     /* Else (gametype is 2 (human vs. computer)) 
      Call getComputerSquare function to get squareChoice. */ 
     else 
     { 
      getComputerSquare(board); 
     } 

     /* If squareChoice is -1 (human player quit) 
       Set gameState to QUIT.*/ 
     if (squareChoice == -1) 
     { 
      gameState = QUIT; 
     } 

     /* Else 
      Insert currentSymbol into board at (squareChoice - 1). 
      Show the current state of the Tic Tac Toe board. 
      Call checkGameState function to determine the gameState. */ 
     if (squareChoice >= 0 && squareChoice <= 8 && board[squareChoice-1] == '0' + squareChoice) 
     { 
      board[squareChoice-1] = currentSymbol; 
     } 
     else 
     { 
      cout <<"Invalid move"; 
      turnNum--; 
      cout << "\n\n"; 
     } 
     checkGameState(board); 
    } 
    return 0; 
}/* end while*/ 

/* If gameState is WIN 
     print "Player " currentSymbol " is the winner." */ 

if (gameState == WIN) 
    cout << "Player" << currentsymbol << "is the winner."; 

/* If gameState is DRAW 
     print "It's a draw." */ 
if (gameState = DRAW) 
cout <<"It's a draw."; 

///////////////////////////////////////////////////////////////////// 

void showBoard(const char board [], int size) 
{ 
    cout << endl; 

    for (int i = 0; i < size ; i++) 
    { 
     cout << board[ i ] << " "; 
     if ((i + 1) % 3 == 0) 
      cout << endl; 
    } 

    cout << endl; 
} 

///////////////////////////////////////////////////////////////////// 

Status checkGameState(const char board[]) 
{ 
    // Board  Array 
    // 
    // 1 2 3  0 1 2 
    // 4 5 6 --> 3 4 5 
    // 7 8 9  6 7 8 
    // 
    // Diagonal winners 
    if (board[ 0 ] == board[ 4 ] && board[ 0 ] == board[ 8 ]) 
     return WIN; 
    else if (board[ 2 ] == board[ 4 ] && board[ 4 ] == board[ 6 ]) 
     return WIN; 
    // Horizontal winners 
    else if (board[ 0 ] == board[ 1 ] && board[ 1 ] == board[ 2 ]) 
     return WIN; 
    else if (board[ 3 ] == board[ 4 ] && board[ 4 ] == board[ 5 ]) 
     return WIN; 
    else if (board[ 6 ] == board[ 7 ] && board[ 7 ] == board[ 8 ]) 
     return WIN; 
    // Vertical winners 
    else if (board[ 0 ] == board[ 3 ] && board[ 3 ] == board[ 6 ]) 
     return WIN; 
    else if (board[ 1 ] == board[ 4 ] && board[ 4 ] == board[ 7 ]) 
     return WIN; 
    else if (board[ 2 ] == board[ 5 ] && board[ 5 ] == board[ 8 ]) 
     return WIN; 
    else 
     // No one has won yet 
     return CONTINUE; 
} 

///////////////////////////////////////////////////////////////////// 

int getHumanSquare(const char board[]) 
{ 
    int squareNum; 

    cout << "\n Input the number of an empty square: (-1 to quit) "; 
    cin >> squareNum; 

    while (checkBadSquare(board, squareNum) == true) 
    { 
     cout << "\n Bad input. Choose another square: "; 
     cin >> squareNum; 
    } 

    return squareNum; 
} 

///////////////////////////////////////////////////////////////////// 

int getComputerSquare(const char board[]) 
{ 
    int squareNum; 

    squareNum = getrandint(1, 9); 

    while (checkBadSquare(board, squareNum) == true) 
    { 
     squareNum = getrandint(1, 9); 
    } 

    return squareNum; 
} 

///////////////////////////////////////////////////////////////////// 

bool checkBadSquare(const char board[], int squareNum) 
{ 
    int realSquareNum = squareNum - 1; // count from 0 

    if (squareNum == -1) 
     return false; // Let quit code pass as a valid square 
    else if (squareNum > 9) 
     return true; // Square numbers out of range are invalid 
    else if (board[ realSquareNum ] == 'o' || board[ realSquareNum ] == 'x') 
     return true; // Already taken squares are invalid 
    else 
     return false; // Valid square number 
} 

///////////////////////////////////////////////////////////////////// 

int getrandint(int min, int max) 
{ 

    int scale, shift; 
    scale = max - min + 1; 
    shift = min; 
    return rand() % scale + shift; 
} 

Answer 1

在这里你的第一条评论是不正确的。

} 
    return 0; 

}/* end while*/ 


/* If gameState is WIN 
     print "Player " currentSymbol " is the winner." */ 

if (gameState == WIN) 
    cout << "Player" << currentsymbol << "is the winner."; 

你叫什么/* end while */实际上是main()末。您在上面看到的}是实际结束您的while循环。

错误告诉你，你正在编写函数外的代码。

Answer 2

语法问题

if (gameState == WIN) 
cout << "Player" << currentSymbol << "is the winner."; 

/* If gameState is DRAW 
print "It's a draw." */ 
if (gameState = DRAW) 
cout <<"It's a draw."; 

应该是内部主..（我认为）现在它是出在全球范围内。

---

逻辑问题

与您的代码可能是上线

if (squareChoice >= 0 && squareChoice <= 8 && board[squareChoice-1] == '0' + squareChoice) 

这需要适当括号。你是什​​么意思

&& board[squareChoice-1] == '0' + squareChoice 

请评论。