C經典之13-Asking的實時監聽---ShinePans

#include 
#include 
#include   //system(); 這個指令需要用到此頭文件
#include  //toupper要用到
#include  //在內存管理時用到的頭文件
void main()
{
	

	char letter;  // Letter typed by the user

	printf("Do you want to continue? (Y/N): ");

	letter = _getch();          // Get the letter  
	letter = toupper(letter);  // Convert letter to uppercase

	while ((letter != 'Y') && (letter != 'N'))
	{
		_putch(7);                  // Beep the speaker
		letter = _getch();          // Get the letter  
		letter = toupper(letter);  // Convert letter to uppercase
	}

	printf("\nYour response was %c\n", letter);


	system("pause");
	
	
}