unblocking getch() in loop

[Kew]

i am try to test the function by looping it until the key 'A' is pressed, however, getch() is blocking the looping, what should i modify so that the program work?

here is my code:

#include <iostream>
#include <ncurses.h>

using namespace std;

int kbhit()
{
	char ch = getch();
	if(ch !=ERR)
	{
		ungetch(ch);
		return 1;
	}
	else
	{
		return 0;
	}
}

int main()
{

	initscr();

	for(long index = 0; index < 100000; index ++)
	{
		cout << index << endl;

		system("stty raw");

		if(kbhit())
		{
			if(getch() == 'a')
			{
				system("stty cooked");
				break;
			}
		}

		system("stty cooked");
	}

	cout << "End of program" << endl;

	endwin();
}