#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <malloc.h>
#include <time.h>
 
//Diffulculy Section
#define EASY 1
#define MED 2
#define HARD 3
#define VHARD 4
#define IMPOS 5
 
//Limits
#define COL_SIZE 9
#define ROW_SIZE 9
#define TOPRANGE 9
#define LOWRANGE 1
 
//Test Parameters
#undef PRINT
#undef TEST
#undef LOOPTEST
#define RANDCHECK
#define SQUARE
 
//Returns
#define SUCCESS 0
#define FAIL 1
#define TRUE 0
#define FALSE 1
#define true 0
#define false 1
 
//Typedef
typedef int bool;
 
//Prototypes
int iPrint(int (*)[]);
int iCheck(int,int (*)[]);
int (*iGenerate(void))[];
 
 
int main(int argc, char *argv[])
{
 
  //Just print the Matrix to the screen from [0][0] to [9][9] 
  //Generate the Matrix and print
  iPrint(iGenerate());
  system("PAUSE");	
  return 0;
}
 
/*
                          iCheck
         
         This function will check the Matrix and make sure
         that the numbers 1 - 9 appear once in each row and 
         once in each column
         
         Accesses:
                  i -> The Random Number
                  (*iMatrix)[] -> The Matrix
         
         Calls:
                NONE
         
         Returns:
                 SUCCESS or FAIL
         
         Written:
                 Date: May 12th 2009
*/
 
int iCheck(int i,int (*iMatrix)[9])
{  
    #ifdef TEST
           printf("\n[Checking Function]: ");
    #endif
    //Sanity Check just for Safety
    if(i != 0 || i <= 9)
    {
         for(int iLoop = 0;iLoop<=8;iLoop++)
         {
            // Look in iMatrix at offset [ROW] [COL]
            // if the number at offset is the same 
            // as the number passed in so i
            // then we just fail and exit
            if( iMatrix[iLoop][0] == i )
            {
                iMatrix[iLoop][0] = -1;
                return FAIL;
            }
         }
    }//End If i != 0 || i <= 9
    return SUCCESS;
}
 
/*
                           iGenerate
 
         This function will Generate the 9x9 Matrix need and 
         fill it with random number 1 - 9.  This function
         Does not check the Matrix just fills it.
         
         Accesses:
                  void
         
         Returns:
                 iMatrix -> (*iMatrix)[]
         
         Calls:
                  iCheck
         
         Written:
                 Date:  May 12th 2009
*/
 
int (*iGenerate(void))[]
{
  //Make a double array of 81 total allocations
  //9x9 and make sure to zero of the intire Matrix
  int (*iMatrix)[9] =  calloc(1,(COL_SIZE * ROW_SIZE) * sizeof(int));
  int iRand = 0;
 
  //Seed the randomizer
  srand(time(NULL));
 
  //Get a index value [iLoop][jLoop] from [0][0] to [9][9]
  for(int iLoop = 0; iLoop <= 8; iLoop++)
  {
       for(int jLoop = 0; jLoop <= 8; jLoop++)
       {
              //Initalize the Matrix
              //While the offset of the pointer to the array is in bound 
              //of [0][0] to [9][9], Place a random value from 1 - 9 into
              //The matrix as long as the max value randomilized is not
              //more then 9 which is the max value
              Rand: while(TOPRANGE < (iRand = LOWRANGE + rand() / (RAND_MAX / TOPRANGE)));
              //The value did not appear in the Matrix
              //So because it didn't appear, we can add
              //Then number into the Matrix
             if( iCheck(iRand,iMatrix) == SUCCESS)
              {
                  #ifdef RANDCHECK
                         printf("Number put in Matrix = %d\n",iRand);
                  #endif
                  *(*(iMatrix + iLoop) + jLoop) = iRand;
              }
              //The number didn't appear
              //We need to take one off the jLoop so we dont expire
              //The loop to fast
              else if(iCheck(iRand,iMatrix) == FAIL)
              {
                  #ifdef RANDCHECK
                         printf("Wont Randize Number Here\n");
                  #endif
                  //If we get here we know that we found a random number
                  //So we need to take 1 from the index coordinates
                  jLoop--;
              }
              #ifdef LOOPCHECK
                     //Loop at the loop varible
                     printf("jLoop = %d\n",jLoop);
              #endif
       }
  }
  return iMatrix;
}
 
/*
                          iPrint
         
         This function will print any Matrix passed to it
         
         Accesses:
                  (*iMatrix)[] -> The Matrix
         
         Returns:
                 2 on Success
         
         Calls:
                 NONE
         
         Written:
                 Date: May 12th 2009
*/
 
int iPrint(int (*iMatrix)[9])
{
   printf("\n");
   for(int iLoop = 0; iLoop <= (sizeof(iMatrix) * sizeof(short)); iLoop++)
   {
           for(int jLoop = 0; jLoop <= (sizeof(iMatrix) * sizeof(short)); jLoop++)
                   printf("%d ",*(*(iMatrix + iLoop) + jLoop));
           #ifdef SQUARE
              printf("\n");
          #endif
   }
   return 2;
}