Segmentation Fault 11 in Flipifneeded Function

[charmedbeauty]

Homework Statement

when I am compiling my code I am getting a segmentation fault when entering in input but I don't know why?

it prints Segmentation fault: 11

Homework Equations

The Attempt at a Solution

This is my code I tried looking up what was causing it but couldn't find the reason please help

void flipifneeded(int array[][MAX_SIZE], int posx, int posy, int turn){

    int x,y,i;
    int deltax = 0;
    int deltay = 0;
 
  
    //down

   while(turn == 1){

      for(deltax = -1; deltax< 2; deltax++){
         for(deltay = -1; deltay< 2; deltay++){

           // deltax = deltax + posx;
           // deltay = deltay + posy;

            if(array[deltax + posx][deltay + posy] == BLACK){
               x = deltax + posx;
               y = deltay + posy;

               for(i = 0; i< 10000; i++){ x += deltax;
                  y += deltay;

                  if((x<0 || x >= MAX_SIZE || y < 0 || y>= MAX_SIZE) ||
                  (array[x][y] == EMPTY)) {
                     break;
                  }
                  if(array[x][y] == BLACK){
                     while((array[x-=deltax][y-=deltay] == WHITE)){
                        array[x][y] = BLACK;
                     }
                     break;

                  }
               }
            }
         }
      }
   }
   while(turn == 2){

      for(deltax = -1; deltax< 2; deltax++){
         for(deltay = -1; deltay< 2; deltay++){

            if(array[deltay + posy][deltax + posx] == WHITE){
               x = deltax + posx;
               y = deltay + posy;

               for(i = 0; i< 10000; i++){

                  x += deltax;
                  y += deltay;

                  if((x<0 || x >= MAX_SIZE || y < 0 || y>= MAX_SIZE) ||
                  (array[x][y] == EMPTY)) {
                     break;
                  }

                  if(array[x][y] == BLACK){
                     while(array[x-=deltax][y-=deltay] = WHITE){
                        array[x][y] = BLACK;

                       }
                     break;
                  }
               }
            }
         }
      }
   }
}

and this is the function I call it from

int playingame(int array[][MAX_SIZE],int turn){
  // char input[2];

   int posx=0;
   int posy=0;
   if((turn == 2)){

      printf("it is Black's turn to move\n");
   }

   else{

      printf("whites turn\n");
   }

   char letter=0;
   int number=0;
   printf("Enter your move: \n");
   letter = getchar();
   number = getchar();
   getchar();

   posy = letter -'a';
   posx = number - '0'-1;

   //int counti = i;
   //int countj = j;


   if((array[posx][posy] == CROSS && turn == 2)){
      printf("error\n");
      turn = 2;
   }
   else if((array[posx][posy] == CROSS && turn == 1)){
      printf("error\n");
      turn = 1;
   }
   if((array[posx][posy] == EMPTY && turn == 2 )){

 array[posx][posy] = BLACK;

      updateboard(array);
      flipifneeded(array,posx, posy, turn);
      turn = nexturn(array, turn);

   }
   else if((array[posx][posy] == EMPTY && turn == 1)){

      array[posx][posy] = WHITE;
      updateboard(array);
      flipifneeded(array, posx, posy, turn);
      turn = nexturn(array, turn);

   }
   

   return turn;
   }

if someone could help me with this that would be great as I am in a bit of a hurry and can't proceed until I fix this issue.

THANKS.!

 

[D H]

                     while(array[x-=deltax][y-=deltay] = WHITE){
                        array[x][y] = BLACK;
                       }

There are at least three things wrong here.

• You aren't protecting against x and y going outside the bounds of the array.
• You should have used == WHITE rather than = WHITE.
• You don't have your compiler warnings set high enough; a good compiler will warn you about using = where it looks like you should have used ==.