【发布时间】：2013-12-14 21:30:50
【问题描述】：
我的任务是创建一个井字游戏，让 X 可以与计算机对战。她希望玩家和计算机的移动是无效的，check 赢家是 int，打印和初始化板也是 int。我不认为我遇到了所有这些，但我只是希望它运行并实际输出正确。这也是我在comp sci 的第一年。在大多数情况下，我认为我的逻辑有效，它只是针对计算机移动方法，我对如何在 3x3 数组中获得随机移动感到困惑，所以这很可能没有意义。我的问题在于主要方法，尝试使用 do..while 循环来允许计算机显示它的移动。我的 machineTurn 方法应该是一个 void 方法，但错误表明它必须是一个 int。我不确定现在出了什么问题，但是我已经查看了这段代码一段时间了。我已经评论了很多。我的错误是：
java:58: 错误：不兼容的类型
move = machineTurn(theSeed);
必需：整数
发现：无效
1 个错误
过程完成。
import java.util.*;
public class TTT
{
public static final int EMPTY = 0;
public static final int COMPUTER = 2;
public static final int NONE = 0;
public static final int USER = 1;
public static final int theSeed = 0;
// Name-constants to represent the various states of the game
public static final int PLAYING = 0;
public static final int DRAW = 1;
public static final int USER_WON = 2;
public static final int COMPUTER_WON = 3;
// The game board and the game status
public static final int ROWS = 3, COLS = 3; // number of rows and columns
public static int[][] board = new int[ROWS][COLS]; // game board in 2D array
// containing (EMPTY, CROSS, NOUGHT)
public static int currentState; // the current state of the game
// (PLAYING, DRAW, CROSS_WON, NOUGHT_WON)
public static int currentPlayer; // the current player (CROSS or NOUGHT)
public static int currentRow, currentCol; // current seed's row and column
public static Scanner in = new Scanner(System.in); // the input Scanner
public static void main(String[] args)
{
int move;
int winner;
initBoard();
printBoard();
// play the game once
do{
yourTurn(currentPlayer);
machineTurn(theSeed);
updateGame(currentPlayer, currentRow, currentCol);
printBoard();
//print message if game-over
if (currentState == USER_WON)
{
System.out.println(" You won! You beat the computer! Congratulations!");
}
else if ( currentState == COMPUTER_WON)
{
System.out.println(" You lost! The Computer Beat you! Sorry! ");
}
else if ( currentState == DRAW)
{
System.out.println(" No One won! It's a draw! ");
}
//switch player
currentPlayer = (currentPlayer == USER) ? COMPUTER : USER;
if( currentPlayer == COMPUTER)
{
move = machineTurn(theSeed);
System.out.println("Computer move: " + move);
}
}while( currentState == PLAYING); //repeat if not game over
}
//initialize game board contents
public static void initBoard()
{
for (int row = 0; row < ROWS; ++row)
{
for (int col = 0; col < COLS; ++col)
{
board[row][col] = EMPTY; // all cells empty
}
}
}
public static void printBoard()
{
for (int row = 0; row < ROWS; ++row)
{
for (int col = 0; col < COLS; ++col)
{
printCell(board[row][col]); // print each of the cells
if (col != COLS - 1)
{
System.out.print("|"); // print vertical partition
}
}
System.out.println();
if (row != ROWS - 1)
{
System.out.println("-----------"); // print horizontal partition
}
}
System.out.println();
}
public static void printCell(int content) {
switch (content) {
case EMPTY: System.out.print(" "); break;
case COMPUTER: System.out.print(" O "); break;
case USER: System.out.print(" X "); break;
}
}
public static boolean checkWinner(int theSeed, int currentRow,int currentCol)
{
return (board[currentRow][0] == theSeed // 3-in-the-row
&& board[currentRow][1] == theSeed
&& board[currentRow][2] == theSeed
|| board[0][currentCol] == theSeed // 3-in-the-column
&& board[1][currentCol] == theSeed
&& board[2][currentCol] == theSeed
|| currentRow == currentCol // 3-in-the-diagonal
&& board[0][0] == theSeed
&& board[1][1] == theSeed
&& board[2][2] == theSeed
|| currentRow + currentCol == 2 // 3-in-the-opposite-diagonal
&& board[0][2] == theSeed
&& board[1][1] == theSeed
&& board[2][0] == theSeed);
}
public static boolean isDraw()
{
for (int row = 0; row < ROWS; row++)
{
for (int col = 0; col < COLS; col++)
{
if (board[row][col] == EMPTY)
{
return false; //an empty cell found, not draw, exit
}
}
}
return true; //no empty cell, it's draw
}
/* Player with the "theSeed" makes one move, with input validation.
Update global variables "currentRow" and "currentCol". */
public static void yourTurn(int theSeed)
{
boolean validInput = false;
do {
if (theSeed == USER)
{
System.out.print("Player 'X', enter your move (row[1-3] column[1-3]): ");
}
int row = in.nextInt() - 1; // array index starts at 0 instead of 1
int col = in.nextInt() - 1;
if (row >= 0 && row < ROWS && col >= 0 && col < COLS && board[row][col] == EMPTY) {
currentRow = row;
currentCol = col;
board[currentRow][currentCol] = theSeed; // update game-board content
validInput = true; // input okay, exit loop
} else {
System.out.println("This move at (" + (row + 1) + "," + (col + 1)
+ ") is not valid. Try again...");
}
} while (!validInput); // repeat until input is valid
}
/* supposed to be machine's random move after USER has gone */
public static void machineTurn(int theSeed)
{
int move = (int)(Math.random()*9);
boolean validInput = false;
do{
if(theSeed == COMPUTER);
{
board[(int)(move/3)][move%3] = currentPlayer;
}
int row = in.nextInt() - 1; // array index starts at 0 instead of 1
int col = in.nextInt() - 1;
if (row >= 0 && row < ROWS && col >= 0 && col < COLS && board[row][col] == EMPTY) {
currentRow = row;
currentCol = col;
board[currentRow][currentCol] = theSeed; // update game-board content
}
}while(validInput = true); // input okay, exit loop
}
public static void updateGame(int theSeed, int currentRow, int currentCol)
{
if(checkWinner(theSeed, currentRow,currentCol))
{
currentState = (theSeed == USER) ? USER_WON : COMPUTER_WON;
}
else if (isDraw()) //check for draw
{
currentState = DRAW;
}
}
//otherwise, no change to currentState (Still PLAYING)
}
此外，为了获得额外奖励，我们必须创建一个不允许玩家获胜的方法。这可能是平局，但电脑总是赢。谁能给我一个关于如何开始编写代码的提示？我将把那台机器命名为SmartMode。
【问题讨论】：
-
编写不允许玩家获胜（只有平局/失败）的代码不是成为一名优秀程序员的问题，而是理解您正在玩的游戏的问题编程。学习井字游戏。
-
你可以使用这个算法：xkcd.com/832
-
错误信息告诉你问题出在什么地方。
-
您在第 58 行的错误是由于您尝试使用返回不是 int 而是返回 void 的方法分配 int 移动。你可以直接说
machineMove(theSeed)，然后放弃move=。 -
move =表示编译器希望该行的其余部分结束计算值。但它只是调用了一个不返回值的方法（void方法）。所以...
标签： java arrays methods multidimensional-array tic-tac-toe