04-02-2014
Then you need to create a variable with the current time and apply some maths to come to the 30min before. That can range from easy to demanding, depending on what you really require. There some threads (e.g. in FAQs) dealing with date/time maths.
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LEARN ABOUT CENTOS
exfixed
exfixed(3alleg4) Allegro manual exfixed(3alleg4)
NAME
exfixed - Using fixed point maths. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
Example exfixed
DESCRIPTION
This program demonstrates how to use fixed point numbers, which are signed 32-bit integers storing the integer part in the upper 16 bits
and the decimal part in the 16 lower bits. This example also uses the unusual approach of communicating with the user exclusively via the
allegro_message() function.
SEE ALSO
END_OF_MAIN(3alleg4), allegro_init(3alleg4), allegro_message(3alleg4), fixdiv(3alleg4), fixed(3alleg4), fixmul(3alleg4), fixsqrt(3alleg4),
fixtof(3alleg4), ftofix(3alleg4), itofix(3alleg4)
Allegro version 4.4.2 exfixed(3alleg4)