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Chapter 8: C Programming
IS_ALARM
Summary:
int is_alarm(n);
int n; Input number
Description:
The is_alarm function checks if there is an active dialout alarm on the input specified
by n. This follows the unacknowledged status on the alarm, so after the alarm is ac-
knowledged by someone, it is no longer considered an alarm even if the physical
condition is still there.
Return value:
The is_alarm function returns a zero if there in no alarm on input n, or a 1 if there is
an alarm.
Example:
This program will set output number 3 on if input 3 is alarming. Otherwise it sets
output 3 off. When input 3 goes into alarm status, the output will be turned on. As
soon as that alarm is acknowledged by someone, the output will be turned off.
main()
{
if (is_alarm(3) == 1)
{
output(3,1);
}
else
{
output(3,0);
}
}