/* 
 *	sounds -- make various sounds on demand 
 */ 
#include <stdio.h> 
#include <conio.h> 
#include <math.h> 
 
#define ESC	27 
 
extern void sound(unsigned int, float); 
 
main() 
{ 
	int ch; 
 
	fprintf(stderr, "1=warble 2=error 3=confirm 4=warn\n"); 
	fprintf(stderr, "Esc=quit\n"); 
	while ((ch = getch()) != ESC) 
		switch (ch) { 
		case '1': 
			warble(); 
			break; 
		case '2': 
			error(); 
			break; 
		case '3': 
			confirm(); 
			break; 
		case '4': 
			warn(); 
			break; 
		} 
	exit(0); 
} 
#define CYCLES	3 
#define LOTONE	600 
#define HITONE	1200 
#define PERIOD	0.1 
 
warble() 
{ 
	int i; 
 
	for (i = 0; i < 2 * CYCLES; ++i) 
		if (i % 2) 
			sound(LOTONE, PERIOD); 
		else 
			sound(HITONE, PERIOD); 
} 
error() 
{ 
	float d = 0.1; 
 
	sound(440, d); 
	sound(220, d); 
} 
confirm() 
{ 
	float d = 0.1; 
 
	sound(440, d); 
	sound(880, d); 
} 
warn() 
{ 
	float d = 0.2; 
 
	sound(100, d); 
}