What is the coding of sudoku 9x9 numbers program using c language?

Answer 1

To implement a Sudoku 9x9 solver in C, you'll typically create a 2D array to represent the grid. The program uses a backtracking algorithm, where you recursively attempt to fill the grid with numbers 1-9, checking for validity at each step. If a number fits, you continue; if not, you backtrack and try the next number. Here’s a basic structure for the code:

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

#define SIZE 9

bool isSafe(int grid[SIZE][SIZE], int row, int col, int num);
bool solveSudoku(int grid[SIZE][SIZE]);
void printGrid(int grid[SIZE][SIZE]);

// Complete your isSafe, solveSudoku, and printGrid functions accordingly.

int main() {
    int grid[SIZE][SIZE] = { /* initialize with the Sudoku puzzle */ };
    if (solveSudoku(grid)) printGrid(grid);
    else printf("No solution exists\n");
    return 0;
}

You'll need to implement the logic in the isSafe and solveSudoku functions to handle the rules of Sudoku.