?? siren.c
字號(hào):
#include <dos.h>
#include <conio.h>
void main(void)
{
unsigned frequency;
do {
for (frequency = 500; frequency <= 1000; frequency += 50)
{
sound(frequency);
delay(50);
}
for (frequency = 1000; frequency >= 500; frequency -= 50)
{
sound(frequency);
delay(50);
}
} while (! kbhit());
nosound();
}
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