[AutotelicBrown]

Also, if is not a loop, when you have something like:

if (unsigned int row = 0 && 20) //values in row 0 and 20 are set to WALL
	{
		tileMap[MAP_WIDTH][row] = WALL; //not sure whether I'm supposed to assign an Ascii Code or just set it to WALL
	}
else
	{
		tileMap[MAP_WIDTH][row] = EMPTY; //any other row set to EMPTY
	}

You are:
-Declaring a new int named row with value being '0 && 20', && being logical and (should evaluate to 0)
-Assigning to tileMap[MAP_WIDTH][row], aka tileMap[MAP_WIDTH][0] the value of EMPTY (because 0 evaluates to false).