fifteen.c - shared from CS50 IDE

fifteen.c

/**
 * Initializes the game's board with tiles numbered 1 through d*d - 1
 * (i.e., fills 2D array with values but does not actually print them).  
 */
void init(void)
{
    // TODO
    int i,j;
    int k=d*d-1;
    for(i=0;i<d;i++)
    {
     for(j=0;j<d;j++)
     {
      board[i][j]=k--;
      if(k%2!=0)
      {
       break;
      }
      else
      {
       if((board[i][j]==2) && (board[i][j-1]==1))
       metrytoexchange(&board[i][j],&board[i][j-1]);
      }
    }
   }
}

/**
 * Prints the board in its current state.
 */
void draw(void)
{// TODO
 int k=d*d-1;
    for(int i=0;i<d;i++)
    {
     for(int j=0;j<d;j++)
     {
         board[i][j]=k--;
         if(board[i][j]==0)
         {
            printf("_"); 
         }
         else
        printf("%d \t",board[i][j]);
     }
     printf("\n");
    }
}
void metrytoexchange(int *a,int *b)
{
   int temp= *a;
   *a = *b;
   *b = temp;
}

/**
 * If tile borders empty space, moves tile and returns true, else
 * returns false. 
 */
bool move(int tile)
{
    int k=d*d-1;
    int blank_space=0;
    //dont go beyond the grid
    for(int i=0;i<d;i++)
    {
     for(int j=0;j<d;j++)
     {
         
       if(tile<k && tile>0 && tile==board[i][j])
       {
       continue;
       }
     else
     {
      break;     
     } 
//iterate to check the position of of blank tile;left to right up and down if not return false
if(board[i-1][j]!=blank_space || board[i][j-1]!=blank_space || board[i+1][j]!=blank_space || board[i][j+1]!=blank_space)
      {
      return false;
      }
      //else swap tile with blank_space
      else
      {
       metrytoexchange(&tile,&blank_space);      
       return true;
      }
     }
    }
    
    return false;
}