C language games: sanziqi (simple version) implementation explanation

Catalog

Preface

Print menu

Initialize chessboard

Print chessboard

Players play chess

The computer plays chess （ Key points ）

Judgement of winning or losing

Combine functions to implement the game

  Source code     

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Preface

        This is an article to realize a simple C Language games 【 Sanzi 】 Explanation , If you have your own idea later, you can add some game items to the small game by yourself .

The final implementation style

              

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Print menu

        We first need to print a game menu for players to choose ,  Start the game or exit the game , Because the menu will be printed out for players to choose before the start of each game ,, And at least once . So we put the menu in do  whlie Inside the loop . The following game code is the same .

void menu(void)   // Since no return value is required and there are no parameters , So the return type and function parameters are void
{
	printf("**********************\n");
	printf("***** 1、 Start the game  *****\n");          // You can adjust the format according to your preference 
	printf("***** 0、 Quit the game  *****\n");          // The effect may be better in the middle of the screen （ I won't ）
	printf("**********************\n");
}

---

Initialize chessboard

        You can see that our chessboard was empty at the beginning , And there are rows and columns to determine the position , Then we can use a two-dimensional character array to store the contents of the chessboard , And initialized to spaces ' '.

// Here we use the form of function to initialize , First, create a two-dimensional character array in the main function 
void star_board(char board[ROW][COL],int row,int col)
{
	for (int i = 0; i < row; i++)          // The two layers of loops represent rows and columns, respectively 
	{
		for (int j = 0; j < col; j++)
		{
			board[i][j] = ' ';    // Initialize to ' '.
		}
	}

---

Print chessboard

        The principle of printing chessboard is the same as that of initializing chessboard , It's a two-layer cycle . But you can control the printing format according to your desired effect .

void put_board(char board[ROW][COL],int row,int col)
{
	for (int i = 0; i < row; i++)
	{
		for (int j = 0; j < col; j++)
		{
			printf(" %c ", board[i][j]);
			if (j < col - 1)                    
				printf("|");                  // Print at the end of each column  | By Region 
		}
		if (i < row - 1)
		{
			printf("\n");
			printf("------------");           // Print at the end of each line —————— Come to the District branch 
			printf("\n");
		}
		else
			printf("\n");

	}
}

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Players play chess

        Players need to input their own coordinates when playing chess, so they need to set two variables to simulate the line （x） And column （y）, And change the corresponding elements in the two-dimensional array to ' * ', Used to distinguish players 、 There is still room for the computer . And remind players when they input wrong coordinates .

// Little details ： Shape parameter ch Is to change the elements in the array to the characters you want , In this way, you can avoid repeatedly defining functions 

void player_move(char board[ROW][COL], int row, int col, char ch)
{
	int x, y;
	printf(" Players play chess , Please enter the coordinates :");
	do {
		scanf("%d%d", &x, &y);
		if (x - 1 > row || y - 1 > col)
		{
			printf(" illegal input , Please enter the correct coordinates ：");     // Give correct prompt when the correct coordinates are not entered 
			continue;
		}
		if (board[x - 1][y - 1] == ' ')
		{
			board[x - 1][y - 1] = ch;            // Change the elements in the array to ch
			break;
		}
		else
			printf(" This coordinate is already occupied , Please re-enter the coordinates ：");   // Give a prompt when you enter the coordinates that have been set 
	} while (1);
	
}

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The computer plays chess （ Key points ）

        This is the key and difficult point of the game . When the computer plays chess, it should be placed inside the chessboard , I still have to go where I haven't been , If we still need to implement various intelligent algorithms, it will be more complicated . We only play chess here （ So the difficulty of this game is to let the computer win ）, The algorithm will not be studied in depth , Interested partners can do their own research .

        When we let the computer play chess, we need to let the computer's chess pieces fall on the chessboard , And it must be something that hasn't been done before , In this case, you need to use the random number function rand 了 , In the use of rand Before we need to use srand To generate a range of random numbers , In the use of srand We also need to use a timestamp function time.【 You can click the function to view the specific function contents 】

void computer_move(char board[ROW][COL], int row, int col, char ch)    // Control the chess piece style of the computer 
{
	printf(" The computer plays chess ：\n");
	
	while (1)
	{
		int x = rand() % 3;        // Make the computer chess pieces fall on the chessboard 
		int y = rand() % 3;
		if (board[x][y] == ' ')        // Judge whether the chessboard has been played 
		{
			board[x][y] = ch;           // The computer plays chess 
			break;
		}
	}
}

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Judgement of winning or losing

        Winning or losing in the game is nothing more than three pieces in a row , So we just need to judge whether this condition is met , If the computer wins, return to the computer's chess pieces , If the player wins, return to the player's chess pieces , If it's a draw （ That is, the chessboard is full, but there are no three pieces to practice ） When , Just go back to &.

char is_win(char board[ROW][COL], int row, int col)
{
	int count = 0;
	for (int i = 0; i < row; i++)
	{
		if (board[i][0] == '*' && board[i][1] == '*' && board[i][2] == '*')
			return '*';
		if (board[i][0] == '#' && board[i][1] == '#' && board[i][2] == '#')
			return '#';
	}
	if ((board[0][0] == '*' && board[1][1] == '*' && board[2][2] == '*') || (board[0][2]     
    == '*' && board[1][1] == '*' && board[2][0] == '*'))
	{
		return '*';
	}
	if ((board[0][0] == '#' && board[1][1] == '#' && board[2][2] == '#') || (board[0][2] 
    == '#' && board[1][1] == '#' && board[2][0] == '#'))
	{
		return '#';
	}
	for (int i = 0; i < col; i++)
	{
		if (board[0][i] == '*' && board[1][i] == '*' && board[2][i] == '*')
			return '*';
		if (board[0][i] == '#' && board[1][i] == '#' && board[2][i] == '#')
			return '#';
	}
	for (int i = 0; i < row; i++)
	{
		for (int j = 0; j < col; j++)
		{
			if (board[i][j] == ' ')
				count++;
		}
	}
	if (count == 0)
	{
		printf(" Game draw ！！");
		return '&';
	}	
}

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Combine functions to implement the game

        After all the functions of the game are realized by functions , Just combine the functions together to implement the game .

void game()
{
	char board[ROW][COL];
	star_board(board, ROW, COL);        // Initialize chessboard 
	put_board(board, ROW, COL);          // Print chessboard 

	do {
		player_move(board, ROW, COL, '*');        // Players play chess 
		put_board(board, ROW, COL);               // Print chessboard 
		if (is_win(board, ROW, COL) == '*')       // Judgement of winning or losing 
		{
			printf(" Game player wins ！！\n");
			break;
		}
		if (is_win(board, ROW, COL) == '&')       // Judge if it's a draw 
		{
			printf(" Game draw !!\n");
			break;
		}
		computer_move(board, ROW, COL, '#');      // The computer plays chess 
		put_board(board, ROW, COL);               // Print chessboard 
		if (is_win(board, ROW, COL) == '#')       // Judgement of winning or losing 
		{
			printf(" Computers win ！！\n");
			break;
		}
		if (is_win(board, ROW, COL) == '&')       // Judgement of winning or losing 
		{
			printf(" Game draw !!\n");
			break;
		}
	} while (1);
}

  Source code     

        If you don't understand anything when implementing this small game, you can view the source code through this address Gobang games : Sanzi chess source code