在 C++ 中编译多个 .hpp 和 .cpp 文件时出错
Errors When Compiling Multiple .hpp and .cpp Files in c++
我刚开始攻读 CS 学位，对实际编程是全新的，因此实施起来很困难。我最近有一个任务让我很困惑。我很困惑，因为我无法 link 将所有文件放在一起（2 个头文件 .hpp 和 2 个实现文件 .cpp）。作业来来去去我很好奇如何将所有文件 link 放在一起，因为我知道在编译时 Board.hpp 和 Board.cpp 文件将编译到一个文件中，TicTacToe.hpp 和 TicTacToe.cpp 文件将编译成一个文件，然后所有两个编译文件将 link 相互编译以生成可执行文件。
这是我尝试在 g++ 中编译时遇到的错误：
TicTacToe.hpp:1:9: warning: #pragma once in main file
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
我不知道那是什么意思。
我将 post 以下文件供您审阅。感谢您提供的任何帮助。再一次，我在这方面是全新的，所以如果你能简单地解释一下，我将非常感激。
Board.hpp
#ifndef BOARD_HPP
#define BOARD_HPP
#include <iostream>
#include <string>
class TTTBoard
{
private:
char Board[3][3]; //creates array
int play(); // prototype for play function
void makeMove(); //prototype for makeMove function
int turn(int); //prototype for turn function
int check(int, int); //prototypr for check function
void print(char x[][3]); //prototype for print function
int gameState(char x[][3]); //prototype for gameState fuction
int player1, player2, draw, player, winner, done; //creates variables to be used.
int row, col; //creates variables to be used in gamestate function
public:
int TtlGames, TtlP1, TtlP2, TtlDraws; //creates variables that will define gamestate
void intBoard(); //prototype for intboard
};
#endif
下一个有点长
Board.cpp
#include "Board.hpp"
#include <iostream>
#include <iomanip>
void TTTBoard::intBoard() //function to initialize the board
{ //initialzes the variables in order
done = false; // to be used for later functions
winner = 0;
player = 2;
player1 = 1;
player2 = 2;
draw = 3;
int i, k;
for (k = 0; k<3; k++) //initializes array to 0
{
for (i = 0; i<3; i++)
{
Board[k][i] = 0;
}
}
play(); //begins the game
}
int TTTBoard::check(int row, int col) //checks if spot if occupied
{
if (Board[row][col] == 0)
{
return true;
}
else if (Board[row][col] != 0)
{
std::cout << "That square is already taken.";
return false;
}
else
{
std::cout << "Checking for win.";
gameState(Board);
}
return false;
}
void TTTBoard::makeMove() //records players move
{
player = turn(player);
int answer = false;
while (answer == false)
{
std::cout << "Player" << turn(player) << ": please enter your move\n";
std::cin >> row, col;
answer = check(row, col);
}
if (player == 1)
Board[row][col] = 'X';
else if (player == 2)
Board[row][col] = 'O';
else
std::cout << "Failed.";
}
int TTTBoard::gameState(char x[][3]) //checks for a win or a draw
{
winner = 0;
int count = 0;
int a = row;
int b = col;
for (a = 0; a<3; a++)
{
for (b = 0; b<3; b++)
{
if (Board[a][b] == 0)
{
count++;
}
}
}
if (count > 0)
{
int row, col, xCheck, oCheck;
for (row = 0; row<3; row++)
{
xCheck = 0;
oCheck = 0;
for (col = 0; col<3; col++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
for (col = 0; col<3; col++)
{
xCheck = 0;
oCheck = 0;
for (row = 0; row<3; row++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
if (x[0][0] == 'X' && x[1][1] == 'X' && x[2][2] == 'X')
{
winner = 1;
}
else if (x[0][0] == 'O' && x[1][1] == 'O' && x[2][2] == 'O')
{
winner = 2;
}
else if (x[2][0] == 'X' && x[1][1] == 'X' && x[0][2] == 'X')
{
winner = 1;
}
else if (x[2][0] == 'O' && x[1][1] == 'O' && x[0][2] == 'O')
{
winner = 2;
}
}
else if (count == 9)
{
std::cout << "Its a draw.";
winner = 3;
}
else
{
std::cout << "It is the next players turn\n\n";
}
if (winner > 0)
{
done = true;
}
return done;
}
void TTTBoard::print(char Board[][3]) //prints current board state
{
std::cout << "\n";
std::cout << " 0 1 2\n";
std::cout << "0 " << Board[0][0] << " " << Board[0][1] << " " << Board[0][2] << " \n";
std::cout << "1 " << Board[1][0] << " " << Board[1][1] << " " << Board[1][2] << " \n";
std::cout << "2 " << Board[2][0] << " " << Board[2][1] << " " << Board[2][2] << " \n";
}
这个也很长
TicTacToe.hpp
#ifndef TICTACTOE_HPP
#define TICTACTOE_HPP
#include "Board.hpp"
#include <iostream>
#include <string>
#include <iomanip>
class Board; //creates a board to be forward declared
class TicTacToe //creates tictactoe class
{
private:
int check(int, int);
int turn(int player);
int play(); //prototype for play method
int gameState(char x[][3]);
public:
int TtlGames, TtlP1, TtlP2, TtlDraws;
void intBoard();
Board* playBoard; //forward declarations for use in functions
Board* print;
Board* makeMove;
Board* BoardT;
};
#endif
TicTacToe.cpp
#include "Board.hpp"
#include "TicTacToe.hpp"
#include <iostream>
#include <string>
void TTTBoard::intBoard() //initializes board
{
done = false;
winner = 0;
player = 2;
player1 = 1;
player2 = 2;
draw = 3;
int i, k;
for (k = 0; k<3; k++)
{
for (i = 0; i<3; i++)
{
Board[k][i] = 0;
}
}
play();
}
int TicTacToe::turn(int player) //informs players of whose turn it is.
{
switch (player)
{
case 1: player = 2;
{
std::cout << "\nPlayers 1 turn.\n\n";
break;
}
case 2: player = 1;
{
std::cout << "\nPlayers 2 turn.\n\n";
break;
}
}
return player;
}
int TTTBoard::gameState(char x[][3]) //checks for win or draw
{
winner = 0;
int count = 0;
int a = row;
int b = col;
for (a = 0; a<3; a++)
{
for (b = 0; b<3; b++)
{
if (Board[a][b] == 0)
{
count++;
}
}
}
if (count > 0)
{
int row, col, xCheck, oCheck;
for (row = 0; row<3; row++)
{
xCheck = 0;
oCheck = 0;
for (col = 0; col<3; col++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
for (col = 0; col<3; col++)
{
xCheck = 0;
oCheck = 0;
for (row = 0; row<3; row++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
if (x[0][0] == 'X' && x[1][1] == 'X' && x[2][2] == 'X')
{
winner = 1;
}
else if (x[0][0] == 'O' && x[1][1] == 'O' && x[2][2] == 'O')
{
winner = 2;
}
else if (x[2][0] == 'X' && x[1][1] == 'X' && x[0][2] == 'X')
{
winner = 1;
}
else if (x[2][0] == 'O' && x[1][1] == 'O' && x[0][2] == 'O')
{
winner = 2;
}
}
else if (count == 9)
{
std::cout << "Its a draw.";
winner = 3;
}
else
{
std::cout << "It is the next players turn\n\n";
}
if (winner > 0)
{
done = true;
}
return done;
}
int TicTacToe::play() //initializes the game
{
int done = false;
Board* print(Board);
while (!done)
{
int count = 0;
Board* makeMove();
Board* (Board);
count++;
if (count != 9)
{
return !done;
}
else
{
done = true;
}
}
return 0;
}
int main() //main method
{
TicTacToe playGame;
playGame.TtlGames = 0, playGame.TtlP1 = 0,
playGame.TtlP2 = 0, playGame.TtlDraws = 0; //counters for total games, Player 1 Total,
int Winner = 0; //Player 2 Total , and Total draws.
char done = false;
while (!done)
{
// This will display before each game
std::cout << "Let's play a game of TicTacToe\n\n";
// Play a game and remember who won (if anyone)
playGame.intBoard();
}
// Finish
std::cout << "\n\nThank you for playing!\n";
std::cin.get();
std::cin.get();
return 0;
}
我尝试了 Code Fuller 的建议，但它给了我这个错误。
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
所以我想也许如果我将 Main 方法放在一个单独的文件中并且 link 它们都可以工作。我明白了：
/tmp/ccmSwwUz.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0x0): multiple definition of `TTTBoard::intBoard()'
/tmp/ccSwOY9D.o:Board.cpp:(.text+0x0): first defined here
/tmp/ccmSwwUz.o: In function `TTTBoard::gameState(char (*) [3])':
TicTacToe.cpp:(.text+0x104): multiple definition of `TTTBoard::gameState(char (* ) [3])'
/tmp/ccSwOY9D.o:Board.cpp:(.text+0x288): first defined here
/tmp/ccSwOY9D.o: In function `TTTBoard::intBoard()':
Board.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
/tmp/ccSwOY9D.o: In function `TTTBoard::makeMove()':
Board.cpp:(.text+0x176): undefined reference to `TTTBoard::turn(int)'
Board.cpp:(.text+0x19b): undefined reference to `TTTBoard::turn(int)'
/tmp/ccmSwwUz.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
/tmp/ccz4019v.o: In function `main':
Main.cpp:(.text+0x48): undefined reference to `TicTacToe::intBoard()'
collect2: ld returned 1 exit status
然后我尝试先将 Board 编译成一个对象，然后 linking TicTacToe 和 Main:
g++ Board.o TicTacToe.cpp Main.cpp -o TTT
并出现以下错误：
/tmp/cc9h5kAs.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0x0): multiple definition of `TTTBoard::intBoard()'
Board.o:Board.cpp:(.text+0x0): first defined here
/tmp/cc9h5kAs.o: In function `TTTBoard::gameState(char (*) [3])':
TicTacToe.cpp:(.text+0x104): multiple definition of `TTTBoard::gameState(char (*) [3])'
Board.o:Board.cpp:(.text+0x288): first defined here
Board.o: In function `TTTBoard::intBoard()':
Board.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
Board.o: In function `TTTBoard::makeMove()':
Board.cpp:(.text+0x176): undefined reference to `TTTBoard::turn(int)'
Board.cpp:(.text+0x19b): undefined reference to `TTTBoard::turn(int)'
/tmp/cc9h5kAs.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
/tmp/ccZlZ4Dn.o: In function `main':
Main.cpp:(.text+0x48): undefined reference to `TicTacToe::intBoard()'
collect2: ld returned 1 exit status
您试图将 Board.cpp 编译为不包含 'main' 入口点的可执行文件。你必须先编译 Board.cpp 到目标文件：
gcc Board.cpp -c
然后你可以用Board.o编译TicTacToe.cpp和link:
gcc Board.o TicTacToe.cpp -o TicTacToe
我刚开始攻读 CS 学位，对实际编程是全新的，因此实施起来很困难。我最近有一个任务让我很困惑。我很困惑，因为我无法 link 将所有文件放在一起（2 个头文件 .hpp 和 2 个实现文件 .cpp）。作业来来去去我很好奇如何将所有文件 link 放在一起，因为我知道在编译时 Board.hpp 和 Board.cpp 文件将编译到一个文件中，TicTacToe.hpp 和 TicTacToe.cpp 文件将编译成一个文件，然后所有两个编译文件将 link 相互编译以生成可执行文件。
这是我尝试在 g++ 中编译时遇到的错误：
TicTacToe.hpp:1:9: warning: #pragma once in main file
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
我不知道那是什么意思。
我将 post 以下文件供您审阅。感谢您提供的任何帮助。再一次，我在这方面是全新的，所以如果你能简单地解释一下，我将非常感激。
Board.hpp
#ifndef BOARD_HPP
#define BOARD_HPP
#include <iostream>
#include <string>
class TTTBoard
{
private:
char Board[3][3]; //creates array
int play(); // prototype for play function
void makeMove(); //prototype for makeMove function
int turn(int); //prototype for turn function
int check(int, int); //prototypr for check function
void print(char x[][3]); //prototype for print function
int gameState(char x[][3]); //prototype for gameState fuction
int player1, player2, draw, player, winner, done; //creates variables to be used.
int row, col; //creates variables to be used in gamestate function
public:
int TtlGames, TtlP1, TtlP2, TtlDraws; //creates variables that will define gamestate
void intBoard(); //prototype for intboard
};
#endif
下一个有点长
Board.cpp
#include "Board.hpp"
#include <iostream>
#include <iomanip>
void TTTBoard::intBoard() //function to initialize the board
{ //initialzes the variables in order
done = false; // to be used for later functions
winner = 0;
player = 2;
player1 = 1;
player2 = 2;
draw = 3;
int i, k;
for (k = 0; k<3; k++) //initializes array to 0
{
for (i = 0; i<3; i++)
{
Board[k][i] = 0;
}
}
play(); //begins the game
}
int TTTBoard::check(int row, int col) //checks if spot if occupied
{
if (Board[row][col] == 0)
{
return true;
}
else if (Board[row][col] != 0)
{
std::cout << "That square is already taken.";
return false;
}
else
{
std::cout << "Checking for win.";
gameState(Board);
}
return false;
}
void TTTBoard::makeMove() //records players move
{
player = turn(player);
int answer = false;
while (answer == false)
{
std::cout << "Player" << turn(player) << ": please enter your move\n";
std::cin >> row, col;
answer = check(row, col);
}
if (player == 1)
Board[row][col] = 'X';
else if (player == 2)
Board[row][col] = 'O';
else
std::cout << "Failed.";
}
int TTTBoard::gameState(char x[][3]) //checks for a win or a draw
{
winner = 0;
int count = 0;
int a = row;
int b = col;
for (a = 0; a<3; a++)
{
for (b = 0; b<3; b++)
{
if (Board[a][b] == 0)
{
count++;
}
}
}
if (count > 0)
{
int row, col, xCheck, oCheck;
for (row = 0; row<3; row++)
{
xCheck = 0;
oCheck = 0;
for (col = 0; col<3; col++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
for (col = 0; col<3; col++)
{
xCheck = 0;
oCheck = 0;
for (row = 0; row<3; row++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
if (x[0][0] == 'X' && x[1][1] == 'X' && x[2][2] == 'X')
{
winner = 1;
}
else if (x[0][0] == 'O' && x[1][1] == 'O' && x[2][2] == 'O')
{
winner = 2;
}
else if (x[2][0] == 'X' && x[1][1] == 'X' && x[0][2] == 'X')
{
winner = 1;
}
else if (x[2][0] == 'O' && x[1][1] == 'O' && x[0][2] == 'O')
{
winner = 2;
}
}
else if (count == 9)
{
std::cout << "Its a draw.";
winner = 3;
}
else
{
std::cout << "It is the next players turn\n\n";
}
if (winner > 0)
{
done = true;
}
return done;
}
void TTTBoard::print(char Board[][3]) //prints current board state
{
std::cout << "\n";
std::cout << " 0 1 2\n";
std::cout << "0 " << Board[0][0] << " " << Board[0][1] << " " << Board[0][2] << " \n";
std::cout << "1 " << Board[1][0] << " " << Board[1][1] << " " << Board[1][2] << " \n";
std::cout << "2 " << Board[2][0] << " " << Board[2][1] << " " << Board[2][2] << " \n";
}
这个也很长
TicTacToe.hpp
#ifndef TICTACTOE_HPP
#define TICTACTOE_HPP
#include "Board.hpp"
#include <iostream>
#include <string>
#include <iomanip>
class Board; //creates a board to be forward declared
class TicTacToe //creates tictactoe class
{
private:
int check(int, int);
int turn(int player);
int play(); //prototype for play method
int gameState(char x[][3]);
public:
int TtlGames, TtlP1, TtlP2, TtlDraws;
void intBoard();
Board* playBoard; //forward declarations for use in functions
Board* print;
Board* makeMove;
Board* BoardT;
};
#endif
TicTacToe.cpp
#include "Board.hpp"
#include "TicTacToe.hpp"
#include <iostream>
#include <string>
void TTTBoard::intBoard() //initializes board
{
done = false;
winner = 0;
player = 2;
player1 = 1;
player2 = 2;
draw = 3;
int i, k;
for (k = 0; k<3; k++)
{
for (i = 0; i<3; i++)
{
Board[k][i] = 0;
}
}
play();
}
int TicTacToe::turn(int player) //informs players of whose turn it is.
{
switch (player)
{
case 1: player = 2;
{
std::cout << "\nPlayers 1 turn.\n\n";
break;
}
case 2: player = 1;
{
std::cout << "\nPlayers 2 turn.\n\n";
break;
}
}
return player;
}
int TTTBoard::gameState(char x[][3]) //checks for win or draw
{
winner = 0;
int count = 0;
int a = row;
int b = col;
for (a = 0; a<3; a++)
{
for (b = 0; b<3; b++)
{
if (Board[a][b] == 0)
{
count++;
}
}
}
if (count > 0)
{
int row, col, xCheck, oCheck;
for (row = 0; row<3; row++)
{
xCheck = 0;
oCheck = 0;
for (col = 0; col<3; col++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
for (col = 0; col<3; col++)
{
xCheck = 0;
oCheck = 0;
for (row = 0; row<3; row++)
{
if (x[row][col] == 'X')
xCheck++;
if (x[row][col] == 'O')
oCheck++;
if (oCheck == 3)
{
winner = 2;
}
if (xCheck == 3)
{
winner = 1;
}
}
}
if (x[0][0] == 'X' && x[1][1] == 'X' && x[2][2] == 'X')
{
winner = 1;
}
else if (x[0][0] == 'O' && x[1][1] == 'O' && x[2][2] == 'O')
{
winner = 2;
}
else if (x[2][0] == 'X' && x[1][1] == 'X' && x[0][2] == 'X')
{
winner = 1;
}
else if (x[2][0] == 'O' && x[1][1] == 'O' && x[0][2] == 'O')
{
winner = 2;
}
}
else if (count == 9)
{
std::cout << "Its a draw.";
winner = 3;
}
else
{
std::cout << "It is the next players turn\n\n";
}
if (winner > 0)
{
done = true;
}
return done;
}
int TicTacToe::play() //initializes the game
{
int done = false;
Board* print(Board);
while (!done)
{
int count = 0;
Board* makeMove();
Board* (Board);
count++;
if (count != 9)
{
return !done;
}
else
{
done = true;
}
}
return 0;
}
int main() //main method
{
TicTacToe playGame;
playGame.TtlGames = 0, playGame.TtlP1 = 0,
playGame.TtlP2 = 0, playGame.TtlDraws = 0; //counters for total games, Player 1 Total,
int Winner = 0; //Player 2 Total , and Total draws.
char done = false;
while (!done)
{
// This will display before each game
std::cout << "Let's play a game of TicTacToe\n\n";
// Play a game and remember who won (if anyone)
playGame.intBoard();
}
// Finish
std::cout << "\n\nThank you for playing!\n";
std::cin.get();
std::cin.get();
return 0;
}
我尝试了 Code Fuller 的建议，但它给了我这个错误。
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
所以我想也许如果我将 Main 方法放在一个单独的文件中并且 link 它们都可以工作。我明白了：
/tmp/ccmSwwUz.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0x0): multiple definition of `TTTBoard::intBoard()'
/tmp/ccSwOY9D.o:Board.cpp:(.text+0x0): first defined here
/tmp/ccmSwwUz.o: In function `TTTBoard::gameState(char (*) [3])':
TicTacToe.cpp:(.text+0x104): multiple definition of `TTTBoard::gameState(char (* ) [3])'
/tmp/ccSwOY9D.o:Board.cpp:(.text+0x288): first defined here
/tmp/ccSwOY9D.o: In function `TTTBoard::intBoard()':
Board.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
/tmp/ccSwOY9D.o: In function `TTTBoard::makeMove()':
Board.cpp:(.text+0x176): undefined reference to `TTTBoard::turn(int)'
Board.cpp:(.text+0x19b): undefined reference to `TTTBoard::turn(int)'
/tmp/ccmSwwUz.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
/tmp/ccz4019v.o: In function `main':
Main.cpp:(.text+0x48): undefined reference to `TicTacToe::intBoard()'
collect2: ld returned 1 exit status
然后我尝试先将 Board 编译成一个对象，然后 linking TicTacToe 和 Main:
g++ Board.o TicTacToe.cpp Main.cpp -o TTT
并出现以下错误：
/tmp/cc9h5kAs.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0x0): multiple definition of `TTTBoard::intBoard()'
Board.o:Board.cpp:(.text+0x0): first defined here
/tmp/cc9h5kAs.o: In function `TTTBoard::gameState(char (*) [3])':
TicTacToe.cpp:(.text+0x104): multiple definition of `TTTBoard::gameState(char (*) [3])'
Board.o:Board.cpp:(.text+0x288): first defined here
Board.o: In function `TTTBoard::intBoard()':
Board.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
Board.o: In function `TTTBoard::makeMove()':
Board.cpp:(.text+0x176): undefined reference to `TTTBoard::turn(int)'
Board.cpp:(.text+0x19b): undefined reference to `TTTBoard::turn(int)'
/tmp/cc9h5kAs.o: In function `TTTBoard::intBoard()':
TicTacToe.cpp:(.text+0xa7): undefined reference to `TTTBoard::play()'
/tmp/ccZlZ4Dn.o: In function `main':
Main.cpp:(.text+0x48): undefined reference to `TicTacToe::intBoard()'
collect2: ld returned 1 exit status
您试图将 Board.cpp 编译为不包含 'main' 入口点的可执行文件。你必须先编译 Board.cpp 到目标文件：
gcc Board.cpp -c
然后你可以用Board.o编译TicTacToe.cpp和link:
gcc Board.o TicTacToe.cpp -o TicTacToe