Console Snake. Snake can crawl in opposite direction

I have tried to make simple Snake from example and find one bug: snake can crawl in oppostie direction. I have tried to fix it by true-fals variables, but something wrong. Can you show me another methods of solving this problem or try to fix my method)

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#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <time.h>
#include <Windows.h>	

using namespace std;

bool gameOver;
const int width = 30;
const int height = 20;
int x, y, fruitX, fruitY, score;
int tailX[100], tailY[100];
int nTail;
enum eDirection { STOP = 0, LEFT, RIGHT, UP, DOWN };
eDirection dir;

void Setup() {
	srand(time(NULL));
	gameOver = false;
	dir = STOP;
	x = width / 2 - 1;
	y = height / 2 - 1;
	fruitX = rand() % width;
	fruitY = rand() % height;
	score = 0;
}

void Draw() {
	Sleep(75);
	system("cls");
	for (int i = 0; i < width + 1; i++)
		cout << "#";
	cout << endl;

	for (int i = 0; i < height; i++) {
		for (int j = 0; j < width; j++) {
			if (j == 0 || j == width - 1)
				cout << "#";
			if (i == y && j == x)
				cout << "S";
			else if (i == fruitY && j == fruitX)
				cout << "F";
			else {
				bool print = false;
				for (int k = 0; k < nTail; k++) {
					if (tailX[k] == j && tailY[k] == i){
						print = true;
						cout << 's';
					}
				}
				if(!print)
					cout << " ";
			}
		}
		cout << endl;
	}

	for (int i = 0; i < width + 1; i++)
		cout << "#";
	cout << endl;
	cout << "Score: " << score << endl;
}

void Input() {

	if (_kbhit()) {
		switch (_getch())
		{
		case 'w': 
			dir = UP;
			break;
		case 's':
			dir = DOWN;
			break;
		case 'a':
			dir = LEFT;
			break;
		case 'd':
			dir = RIGHT;
			break;
		case 'x':
			gameOver = true;
		}
	}
}

void Logic() {
	bool keyA = true, keyD = true, keyW = true, keyS = true;
	int prevX = tailX[0];
	int prevY = tailY[0];
	int prev2X, prev2Y;
	tailX[0] = x;
	tailY[0] = y;
	for (int i = 1; i < nTail; i++) {
		prev2X = tailX[i];
		prev2Y = tailY[i];
		tailX[i] = prevX;
		tailY[i] = prevY;
		prevX = prev2X;
		prevY = prev2Y;
	}
	switch (dir)
	{
	case LEFT:
		if (keyA = true) 
			x--;
		keyD = false;
		keyS = true;
		keyW = true;
		break;
	case RIGHT:
		if (keyD = true) 
			x++;
		keyA = false;
		keyW = true;
		keyS = true;
		break;
	case UP:
		if (keyW = true) 
			y--;
		keyA = true;
		keyD = true;
		keyS = false;
		break;
	case DOWN:
		if (keyS = true)
			y++;
		keyA = true;
		keyD = true;
		keyW = false;
		break;
	}
	//if (x > width || x < 0 || y > height || y < 0)
	//	gameOver = true;
	if (x >= width - 1)
		x = 0;
	else if (x < 0)
		x = width - 2;
	if (y >= height)
		y = 0;
	else if (y < 0)
		y = height - 1;

	for (int i = 0; i < nTail; i++) {
		if (tailX[i] == x && tailY[i] == y)
			gameOver = true;
	}

	if (x == fruitX && y == fruitY) {
		score += 10;
		fruitX = rand() % width;
		fruitY = rand() % height;
		nTail++;
	}

}




int main()
{
	Setup();
	while (!gameOver) {
		Draw();
		Input();
		Logic();
	}
    return 0;
}
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