用c语言代码写一个数独游戏

好的，以下是用C语言实现的数独游戏代码：

#include <stdio.h>
#include <stdbool.h>

#define SIZE 9

bool is_row_valid(int sudoku[][SIZE], int row, int num) {
    for (int col = 0; col < SIZE; col++) {
        if (sudoku[row][col] == num) {
            return false;
        }
    }
    return true;
}

bool is_col_valid(int sudoku[][SIZE], int col, int num) {
    for (int row = 0; row < SIZE; row++) {
        if (sudoku[row][col] == num) {
            return false;
        }
    }
    return true;
}

bool is_box_valid(int sudoku[][SIZE], int start_row, int start_col, int num) {
    for (int row = 0; row < 3; row++) {
        for (int col = 0; col < 3; col++) {
            if (sudoku[row + start_row][col + start_col] == num) {
                return false;
            }
        }
    }
    return true;
}

bool is_valid(int sudoku[][SIZE], int row, int col, int num) {
    return is_row_valid(sudoku, row, num) &&
           is_col_valid(sudoku, col, num) &&
           is_box_valid(sudoku, row - row % 3, col - col % 3, num);
}

bool find_unassigned(int sudoku[][SIZE], int *row, int *col) {
    for (*row = 0; *row < SIZE; (*row)++) {
        for (*col = 0; *col < SIZE; (*col)++) {
            if (sudoku[*row][*col] == 0) {
                return true;
            }
        }
    }
    return false;
}

bool solve_sudoku(int sudoku[][SIZE]) {
    int row, col;

    if (!find_unassigned(sudoku, &row, &col)) {
        return true;
    }

    for (int num = 1; num <= 9; num++) {
        if (is_valid(sudoku, row, col, num)) {
            sudoku[row][col] = num;

            if (solve_sudoku(sudoku)) {
                return true;
            }

            sudoku[row][col] = 0;
        }
    }

    return false;
}

void print_sudoku(int sudoku[][SIZE]) {
    for (int row = 0; row < SIZE; row++) {
        for (int col = 0; col < SIZE; col++) {
            printf("%d ", sudoku[row][col]);
        }
        printf("\n");
    }
}

int main() {
    int sudoku[SIZE][SIZE] = {
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
        {0, 0, 0, 0, 0, 0, 0, 0, 0},
    };

    if (solve_sudoku(sudoku)) {
        print_sudoku(sudoku);
    } else {
        printf("No solution found.\n");
    }

    return 0;
}

这个程序实现了数独游戏的求解功能，可以通过修改 `sudoku` 数组中的初始值来设置不同的数独谜题。