main.cpp

#include <iostream>
#include <cstdio>
#include "sudoku.h"

using namespace std;

int main() {

  char board[9][9];

  /* This section illustrates the use of the pre-supplied helper functions. */
  cout << "============= Pre-supplied functions =============" << "\n\n";

  cout << "Calling load_board():" << '\n';
  load_board("easy.dat", board);

  cout << '\n' << "Displaying Sudoku board with display_board():" << '\n';
  display_board(board);
  cout << "Done!" << "\n\n";


  cout << "=================== Question 1 ===================" << "\n\n";

  load_board("easy.dat", board);
  cout << "Board is ";
  if (!is_complete(board))
    cout << "NOT ";
  cout << "complete." << "\n\n";

  load_board("easy-solution.dat", board);
  cout << "Board is ";
  if (!is_complete(board))
    cout << "NOT ";
  cout << "complete." << "\n\n";

  cout << "=================== Question 2 ===================" << "\n\n";

  load_board("easy.dat", board);

  /* Should be OK */
  cout << "Putting '1' into I8 is ";
  if (!make_move("I8", '1', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing row duplicate*/
  cout << "Putting '7' into I7 is ";
  if (!make_move("I7", '7', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing column duplicate*/
  cout << "Putting '3' into H7 is ";
  if (!make_move("H7", '3', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing square duplicate*/
  cout << "Putting '7' into H1 is ";
  if (!make_move("H1", '7', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing lowercase row index */
  cout << "Putting '6' into a1 is ";
  if (!make_move("a1", '6', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing row out of bounds */
  cout << "Putting '5' into Y2 is ";
  if (!make_move("Y2", '5', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing column out of bounds */
  cout << "Putting '1' into I11 is ";
  if (!make_move("I11", '1', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

  /* Testing non-numerical input */
  cout << "Putting '*' into E5 is ";
  if (!make_move("E5", '*', board)) 
    cout << "NOT ";
  cout << "a valid move. The board is:" << '\n';
  display_board(board);

   /* Testing pre-filled sudoku position */
   cout << "Putting '7' into A6 is ";
   if (!make_move("A6", '7', board)) 
        cout << "NOT ";
    cout << "a valid move. The board is:" << '\n';
    display_board(board);

  cout << "=================== Question 3 ===================" << "\n\n";

  load_board("easy.dat", board);
  if (save_board("easy-copy.dat", board))
    cout << "Save board to 'easy-copy.dat' successful." << '\n';
  else
    cout << "Save board failed." << '\n';
  cout << '\n';

  cout << "=================== Question 4 ===================" << "\n\n";

  load_board("easy.dat", board);
  if (solve_board(board)) {
    cout << "The 'easy' board has a solution:" << '\n';
    display_board(board);
  } else 
    cout << "A solution cannot be found." << '\n';
  cout << '\n';

  load_board("medium.dat", board);
  if (solve_board(board)) {
    cout << "The 'medium' board has a solution:" << '\n';
    display_board(board);
  } else 
    cout << "A solution cannot be found." << '\n';
  cout << '\n';

  cout << "=================== Question 5 ===================" << "\n\n";

  load_board("mystery1.dat", board);
  if (solve_board(board)) {
    cout << "The 'mystery1' board has a solution:" << '\n';
    display_board(board);
  } else 
    cout << "A solution cannot be found." << '\n';
  cout << '\n';
    
    cout << "===============================================" << endl;

  solve_mystery_board("mystery1.dat");

    cout << "===============================================" << endl;

  load_board("mystery2.dat", board);
  if (solve_board(board)) {
    cout << "The 'mystery2' board has a solution:" << '\n';
    display_board(board);
  } else 
    cout << "A solution cannot be found." << '\n';
  cout << '\n';

  load_board("mystery3.dat", board);
  if (solve_board(board)) {
    cout << "The 'mystery3' board has a solution:" << '\n';
    display_board(board);
  } else 
    cout << "A solution cannot be found." << '\n';
  cout << '\n';

    cout << "===============================================" << endl;

  solve_mystery_board("mystery3.dat");

    cout << "===============================================" << endl;
  
  return 0;
}