dowhile problem

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');