c++ - GetAsyncKeyState makes my program crash when I open it - c++

Question

So I'm making a game that runs on the console. I started with some functions to make drawing to the screen easier, and that worked fine. Then when I tried to add input (using the function GetAsyncKeyState), the program crashed as soon as I started the program. It said: "Text Game.exe has stopped working" Here's how I handled the code:
if(GetAsyncKeyState('A' && 0x8000)) {
x -= 1;
}
if(GetAsyncKeyState('D' && 0x8000)) {
x += 1;
}
if(GetAsyncKeyState('W' && 0x8000)) {
y += 1;
}
if(GetAsyncKeyState('S' && 0x8000)) {
y += 1;
}
If it helps, I got this method by reading this:
How to check if a Key is pressed
EDIT: So I ran it in debug mode, and it said it crashed when I ran a function I made called "refreshScreen();". I don't know why though. Here's the code:
void refreshScreen() {
system("CLS");
for ( int i = 0; i < screenHeight; i++ ) {
for ( int j = 0; j < screenWidth; j++ ) {
cout << screen[i][j];
}
cout << endl;
}
}
It's meant to clear the console, then print all of the contents of array "screen". "Screen", by the way, is the buffer that I write to.

Answer 1

If you are trying to use the GetAsyncKeyState as it's described in answers by the link you provided, you are doing it wrong.
Documentation says the following:
If the function succeeds, the return value specifies whether the key was pressed since the last call to GetAsyncKeyState, and whether the key is currently up or down. If the most significant bit is set, the key is down, and if the least significant bit is set, the key was pressed after the previous call to GetAsyncKeyState.
So what is done in the answer by the link you provided:
if (GetAsyncKeyState('W') & 0x8000)
{ /*key is down*/ }
In the if statement there bitwise "and" operation is performed on return value of GetAsyncKeyState function and 0x8000 constant - which equals to 0x8000 the most significant bit is set or equals to 0 when it is not set.
What is your code doing:
if(GetAsyncKeyState('A' && 0x8000)) // ...
logical "and" operation between 'A' and 0x8000 constant - gives true which is casted to 1 and passed to GetAsyncKeyState as an argument.
[EDIT]: As it was mentioned in comments, 1 corresponds to left mouse button. So all if conditions will be true in case left mouse button is down and will be false otherwise. Probably, crash appears in different part of your program after unexpected change of x and y values. You should debug your program to localize the crash.