object-oriented-C-plus-plus/Fancy 8 Queens.cpp at master · moiscoding/object-oriented-C-plus-plus · GitHub

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#include <iostream>
#include <cmath>
#include <cstdlib>
using namespace std;

//Mohammed Chowdhury
//CS 211-22C
//Assignment #11

bool ok(int q[], int c);
void print(int q[]);
void next(int q[], int c);


int main(){
  int q[8];
  next(q, 0);
  return 0;
}
//..................FUNCTIONS................//


bool ok(int q[], int c) {
  for (int i = 0; i < c; ++i)
    if (q[i] == q[c] || abs(q[i] - q[c]) == c - i)
    return false;
  return true;
}

void print(int q[]) {
   static int solution = 0;
   int i, j, k, l;
   typedef char box[5][7];   // box is now a data type: a 5x7 2D array of characters
   box bb, wb, *board[8][8]; // bb and wb are boxes (5x7 arrays).  board is an 8x8 array of pointers to boxes.
                             // You don't have to clean up the board after printing, because it's not static,
                             // so it'll be reinitialized the next time you call the funtion.

   // Fill in bb (black box) and wb (white box).  They each represent a square of the chessboard.
   // You only need to create one of each, since the chessboard can contain many pointers to the same box.
   for (i=0; i<5; i++)
      for (j=0; j<7; j++) {
         bb[i][j] = ' ';
         wb[i][j] = char(219);
      }

   // Create 2 more boxes to represent the queens, by drawing a picture of each queen in the 2D array.
   static box bq = { {char(219),char(219),char(219),char(219),char(219),char(219),char(219)},
                     {char(219),' '      ,char(219),' '      ,char(219),' '      ,char(219)},
                     {char(219),' '      ,' '      ,' '      ,' '      ,' '      ,char(219)},
                     {char(219),' '      ,' '      ,' '      ,' '      ,' '      ,char(219)},
                     {char(219),char(219),char(219),char(219),char(219),char(219),char(219)} };

   static box wq = { {' '      ,' '      ,' '      ,' '      ,' '      ,' '      ,' '      },
                     {' '      ,char(219),' '      ,char(219),' '      ,char(219),' '      },
                     {' '      ,char(219),char(219),char(219),char(219),char(219),' '      },
                     {' '      ,char(219),char(219),char(219),char(219),char(219),' '      },
                     {' '      ,' '      ,' '      ,' '      ,' '      ,' '      ,' '      } };

   // Fill board with pointers to bb and wb in alternate positions.
   for(i=0; i<8; i++)
      for(j=0; j<8; j++)
         if((i+j)%2 == 0)
            board[i][j] = &wb;
         else
            board[i][j] = &bb;

   // Set up the current solution on the chessboard by placing pointers to bq and wq in the appropriate squares.
   // Place black queens on white squares and white queens on black squares, so that you will be able to see them when printing.
   // Write the code.
   //***
   cout << "Solution #" << ++solution << ":\n ";
   for (i = 0; i <8;i++)
     if ( (q[i]+i) %2 == 0 )
       board[q[i]][i] = &bq;
     else board[q[i]][i] = &wq;


   // Print upper border
   for (i=0; i<7*8; i++)
      cout << '_';
   cout << "\n";

   // Print the board
   for (i=0; i<8; i++)          // for each board row
      for (k=0; k<5; k++) {     // for each box row
         cout << char(179);
         for (j=0; j<8; j++)    // for each board column
            for (l=0; l<7; l++) // for each box column
               // board[i][j] is the box pointer in the ith row, jth column of the board.
               // *board[i][j] is the box being pointed to.
               // (*board[i][j])[k][l] is the kth row, lth column of the box.
               cout << (*board[i][j])[k][l];
         cout << char(179) << "\n";
      }

   // Print lower border
   cout << " ";
   for (i=0; i<7*8; i++)
      cout << char(196);
   cout << "\n\n";
}

void next(int q[], int c) {
   if (c == 8)
      print(q);
   else for (q[c] = 0; q[c] < 8; ++q[c])
      if (ok(q, c))
         next(q, c+1);
}