#include <stdio.h>

void jsw_flush(void);

#define FALSE 0 
#define TRUE !FALSE 

int main(void)
{
	int done; 
	int ch; /* getchar returns int. This is important! */ 
	
	done = FALSE; 
	printf("Would you like me to send your password to the bad guys?\n"); 
	while(!done) 
	{ 
		printf("Enter Y or N (Y/N)"); 
		ch = getchar(); 
		switch(ch) 
		{ 
			case 'N': 
			case 'n': 
				printf("Well, then: your password is safe!\n"); 
				done = TRUE; 
				break; 
			case 'Y': 
			case 'y': 
				printf("Okay, sending your password!\n"); 
				done = TRUE; 
				break; 
			default: 
				printf("You must enter a Y or N!\n"); 
				jsw_flush(); 
		} /* end switch */ 
	} /* end while */
	return 0;
}

void jsw_flush(void)
{
	int ch;

	do
		ch = getchar();
	while (ch != EOF && ch != '\n');

	clearerr(stdin);
}