// Exercise A: This program print out the Sudoku Puzzle
//             and its solution in a Console window
#include <fstream.h>

//---------------------------------------------------------------------------
int main( )             // The program does not take any input arguments
{
   char filename[15] = "sudoku001.txt";   // To specify a different file
                                          // change filename here
   char str[81];        // stores the header string
   char ch;             // stores current character read from file

   ifstream infile;     // declaration for the input file variable

   infile.open(filename);       // open the file
   infile.getline(str,81);      // read the header line

   cout << "The puzzle is: \n\n";
   while (infile.get(ch)) {     // 3 possible actions:
       if (ch == '\n')          //      1. output CR/LF
           cout << endl;        //      2. 1-9 are given digits, just output
       else if ((ch >= '1') && (ch <= '9'))
           cout << ch;          //      3. Anything else is unknown
       else
           cout << '-';
   }
   infile.close();              // close the file - finished reading

   cout << "\n" << "The solution is: \n\n";
   infile.open(filename);      // opent he file again, this time for solution
   infile.getline(str,81);     // skip the header line
   
   while (infile.get(ch)) {    //  Now 4 possibilities:

       if (ch == '\n')         //       1. output CR/LF as is
           cout << endl;
       else if ((ch >= '1') && (ch <= '9'))     // 2. 1-9 as given
           cout << ch;
       else if ((ch >= 'A') && (ch <= 'I'))     // 3. A-I are solutions
                                                //    translate 'A' as '1' etc
           cout << char(int(ch) - int('A') + int('1'));
       else
           cout << '-';                         // 4. Anything else, output '-'
   }
   infile.close();

   getchar();
   return 0;
}