求代码 console中只能输入Y或N，无法输入其它的字符,该如何解决

求代码 console中只能输入Y或N，无法输入其它的字符
求C++代码   console中比如问是否确定，然后只能输入Y或N，无法输入其它的字符，按其它的按键都不会打上去。谢谢

------解决方案--------------------

#include <windows.h>
#include <iostream>

using namespace std;

int getYorN()
{
static HANDLE hIn = GetStdHandle(STD_INPUT_HANDLE);
INPUT_RECORD ir;
DWORD n;

while (1)
{
ReadConsoleInput(hIn, &ir, 1, &n);
while( ir.EventType != KEY_EVENT || !ir.Event.KeyEvent.bKeyDown )
ReadConsoleInput(hIn, &ir, 1, &n);
FlushConsoleInputBuffer(hIn);

WORD vk = ir.Event.KeyEvent.wVirtualKeyCode;
WORD vs = ir.Event.KeyEvent.wVirtualScanCode;
WORD ck = ir.Event.KeyEvent.dwControlKeyState;

if( vk == 'Y ' || vk == 'N ' )
return vk;
}

return 0;
}


int main()
{
cout < < "yes or no: ";
char c = getYorN();
cout < < "[ " < < c < < "] " < < endl;
}