C语言实现数独游戏攻略

介绍

数独是一种逻辑填数游戏，通过在九宫格中填入数字1-9，使得每行、每列、每个九宫格内的数字都没有重复。C语言可以实现数独游戏，并对玩家的答案进行检测。

步骤

1. 定义九宫格

首先需要定义一个二维数组来表示数独的九宫格。在C语言中，可以使用如下代码定义一个9x9的九宫格：

int grid[9][9];

2. 初始化九宫格

在定义好九宫格之后，需要将九宫格初始化为0，表示还没有填入数字。

for (int i = 0; i < 9; i++) {
   for (int j = 0; j < 9; j++) {
      grid[i][j] = 0;
   }
}

3. 输入数字

可以使用scanf函数来从控制台读取玩家输入的数字，并将其存储到九宫格中。需要注意的是，scanf函数返回值为成功读取的变量个数，所以应该检查其返回值是否为1。

int row, col, val;

printf("Enter row, column, and value (separated by spaces):\n");
while (scanf("%d %d %d", &row, &col, &val) == 3) {
   grid[row-1][col-1] = val;
   printf("Enter row, column, and value (separated by spaces):\n");
}

在上述代码中，玩家需要按照“行列数字”的顺序输入，输入完毕后需要按回车键确认。

4. 检查九宫格

为了判断玩家的答案是否正确，需要编写一个函数来检查九宫格。该函数需要遍历九宫格的每一行、每一列以及每个3x3的小九宫格，判断其中是否有重复的数字。如果检查完成后仍然没有发现重复的数字，则意味着玩家已经填写完毕并且答案正确。

int check_grid() {
   int nums[10];

   // Check each row
   for (int i = 0; i < 9; i++) {
      for (int j = 0; j < 10; j++) {
         nums[j] = 0;
      }
      for (int j = 0; j < 9; j++) {
         if (grid[i][j] == 0) {
            continue;
         }
         if (nums[grid[i][j]] == 1) {
            return 0;
         }
         nums[grid[i][j]] = 1;
      }
   }

   // Check each column
   for (int i = 0; i < 9; i++) {
      for (int j = 0; j < 10; j++) {
         nums[j] = 0;
      }
      for (int j = 0; j < 9; j++) {
         if (grid[j][i] == 0) {
            continue;
         }
         if (nums[grid[j][i]] == 1) {
            return 0;
         }
         nums[grid[j][i]] = 1;
      }
   }

   // Check each 3x3 box
   for (int box_row = 0; box_row < 3; box_row++) {
      for (int box_col = 0; box_col < 3; box_col++) {
         for (int i = 0; i < 10; i++) {
            nums[i] = 0;
         }
         for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
               int row = box_row * 3 + i;
               int col = box_col * 3 + j;
               if (grid[row][col] == 0) {
                  continue;
               }
               if (nums[grid[row][col]] == 1) {
                  return 0;
               }
               nums[grid[row][col]] = 1;
            }
         }
      }
   }
   return 1;
}

5. 示例

下面是一个示例游戏：

Enter row, column, and value (separated by spaces):
1 1 5
Enter row, column, and value (separated by spaces):
1 2 3
Enter row, column, and value (separated by spaces):
1 5 7
Enter row, column, and value (separated by spaces):
2 1 6
Enter row, column, and value (separated by spaces):
2 4 1
Enter row, column, and value (separated by spaces):
2 5 9
Enter row, column, and value (separated by spaces):
2 6 5
Enter row, column, and value (separated by spaces):
3 2 9
Enter row, column, and value (separated by spaces):
3 3 8
Enter row, column, and value (separated by spaces):
3 8 6
Enter row, column, and value (separated by spaces):
4 1 8
Enter row, column, and value (separated by spaces):
4 5 6
Enter row, column, and value (separated by spaces):
4 9 3
Enter row, column, and value (separated by spaces):
5 1 4
Enter row, column, and value (separated by spaces):
5 4 8
Enter row, column, and value (separated by spaces):
5 6 3
Enter row, column, and value (separated by spaces):
5 9 1
Enter row, column, and value (separated by spaces):
6 3 3
Enter row, column, and value (separated by spaces):
6 8 2
Enter row, column, and value (separated by spaces):
6 9 6
Enter row, column, and value (separated by spaces):
7 2 6
Enter row, column, and value (separated by spaces):
7 7 2
Enter row, column, and value (separated by spaces):
7 8 8
Enter row, column, and value (separated by spaces):
8 5 2
Enter row, column, and value (separated by spaces):
8 6 8
Enter row, column, and value (separated by spaces):
8 9 5
Enter row, column, and value (separated by spaces):
9 5 1
Enter row, column, and value (separated by spaces):
9 9 9

在输入完毕后，可以调用check_grid函数检查答案。由于上述输入是正确的，运行check_grid函数会返回1。

下面是另一个示例游戏，其中第一行填入了重复的数字。

Enter row, column, and value (separated by spaces):
1 1 5
Enter row, column, and value (separated by spaces):
1 2 3
Enter row, column, and value (separated by spaces):
1 5 7
Enter row, column, and value (separated by spaces):
1 6 5
Enter row, column, and value (separated by spaces):
2 1 6
Enter row, column, and value (separated by spaces):
2 4 1
Enter row, column, and value (separated by spaces):
2 5 9
Enter row, column, and value (separated by spaces):
2 6 5
Enter row, column, and value (separated by spaces):
3 2 9
Enter row, column, and value (separated by spaces):
3 3 8
Enter row, column, and value (separated by spaces):
3 8 6
Enter row, column, and value (separated by spaces):
4 1 8
Enter row, column, and value (separated by spaces):
4 5 6
Enter row, column, and value (separated by spaces):
4 9 3
Enter row, column, and value (separated by spaces):
5 1 4
Enter row, column, and value (separated by spaces):
5 4 8
Enter row, column, and value (separated by spaces):
5 6 3
Enter row, column, and value (separated by spaces):
5 9 1
Enter row, column, and value (separated by spaces):
6 3 3
Enter row, column, and value (separated by spaces):
6 8 2
Enter row, column, and value (separated by spaces):
6 9 6
Enter row, column, and value (separated by spaces):
7 2 6
Enter row, column, and value (separated by spaces):
7 7 2
Enter row, column, and value (separated by spaces):
7 8 8
Enter row, column, and value (separated by spaces):
8 5 2
Enter row, column, and value (separated by spaces):
8 6 8
Enter row, column, and value (separated by spaces):
8 9 5
Enter row, column, and value (separated by spaces):
9 5 1
Enter row, column, and value (separated by spaces):
9 9 9

在输入完毕后，运行check_grid函数会返回0，表示玩家的答案错误。

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C语言实现数独游戏