I'm playing around in Objective-C with a "foundation tool" (Objective-C command line utility) project in Xcode. At the end of my program, it's supposed to go to a clock that updates itself in the Terminal window. The problem is that it doesn't start on the right time, so it's almost always off by a fraction of a second. I tried to fix that by having it wait until the nanosecond time is a multiple of 10^9, but this ends up just going into infinite loop. What am I doing wrong, and is there a better way (I'm guessing there is)?
double nano = 1111111111111;
while (fmod(nano, 1000000000) != 0){
nano = [NSDate timeIntervalSinceReferenceDate];
} //This while loop waits for the nanoseconds to be divisible by 10^9.
while (true){
formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat"dd-MM-yyyy HH:mm:ss"];
dateString = [formatter stringFromDate:[NSDate date]];
printf([dateString UTF8String]); printf("\n");
sleep(1); // or usleep(3000000);
system("clear");
}
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