printf("Do you want to play again?(Yes or No):\n");
do
{
	scanf("%c", &again);
	again = (again >= 'A' && again <= 'Z') ? again + ('a' - 'A') : again;
	if (again == 'y' || again == 'n')
		printf("Incorrect value(Y/N)\n");
}while (again != 'y' && again != 'n');