snake game

[kretze]

hey guys im doing a snake game(its not nearly finished) but i have a one problem...my snake-head is always goes on the left...but its suposed to be on the center of wall because i have to move snake-head with keys(a.s.d.w) can anyone help me???

  #include <iostream>   
#include <stdlib.h> 
#include <string> 
#include<conio.h>
using namespace std;

bool gameOver;
const int width = 20;
const int height = 20;
int x, y, fruitX, fruitY, score;
enum Edirection { LEFT, RIGHT, UP, DOWN, stop = 0 };
Edirection dir;


void setup()
{
	gameOver = false;
	dir = stop;
	x = width / 2;
	y = height / 2;
	fruitX = rand() % width;
	fruitY = rand() % height;
	score = 0;

}
void Draw()
{
	system("cls");
	for (int i = 0; i < width + 2; i++)
		cout << "#";
	cout << endl;
	for (int i = 0; i < height; i++)
	{
		for (int j = 0; j < width; j++)
		{
			if (j == 0)
				cout << "#";
			if (i == y&&j == x)
				cout << "O";
			else if (i == fruitY && j == fruitX)
				cout << "F";

			else
				cout << " ";


			if (j == width - 1)
				cout << "#";
		}
		cout << endl;
	}

	for (int i = 0; i < width + 2; i++)
		cout << "#";
	cout << endl;

}
void input()
{
	if (_kbhit())
	{
		switch (_getch())
		{
		case 'a':
			dir = LEFT;
			break;

		case 'd':
			dir = RIGHT;
			break;

		case 'w':
			dir = UP;
			break;

		case 's':
			dir = DOWN;
			break;

		case 'x':
			gameOver = true;
			break;

		}


	}

}

void logic()
{
	switch (dir)
	{
	case LEFT:
		x--;
		break;
	case RIGHT:
		x++;
		break;
	case UP:
		y--;
		break;
	case DOWN:
		y++;
		break;

	default:
		break;
	}
}



int main()
{
	setup();
	while (!gameOver)
	{
		Draw();
		input();
		logic();
	}

	system("pause");// 
	return 0;
}