Re: [MacPerl] math and "big numbers"

["Paul J. Schinder" <schinder@pjstoaster.pg.md.us>]

David Turley <dturley@illuminet.net> writes:
}Can someone please tell me what it is about Math on the Mac that I am missing?

Integer bugs in 5.002.  It has nothing to do with math; it has everything
to do with integer representations in 32 bit words.

}
}I've written a date comparison script that runs just fine on Perl for Win32
}(which I'm stuck with at work), or when I upload it to my Apache server.
}
}When I try to run the script on MacPerl I get very strange numbers. The
}library routines appear the same so I'm not sure what the problem is. I
}found the script below in the O'Reilly's CGI book which is very similar to
}the code I am using. It too will run on Win but not the Mac.
}
}On the Mac this script tells me there are 34193 days until tommorow, or for
}that matter ANY day in the future!
}
}And I was jusy beginning to feel like I understood MacPerl  :-(
}
}#!/usr/local/bin/perl
}
}require "timelocal.pl";

Don't use timelocal.pl.  Use Time::Local.  Time::Local has been fixed.
timelocal.pl has not.

#!/usr/local/bin/perl

use Time::Local;

$chosen_date = "08/14/97";

if ($chosen_date =~ m|^(\d+)/(\d+)/(\d+)$|) {
    ($month, $day, $year) = ($1, $2, $3);
    print "$month $day $year\n";

    $month -= 1;

    if ($year > 1900) {
        $year -= 1900;
    }

    $chosen_secs = timelocal (0,0,0, $day, $month, $year);

    $seconds_in_day = 60 * 60 * 24;
    $time = time;
    $difference = $chosen_secs - $time;
    print "$difference\n";
    $no_days = $difference/ $seconds_in_day;
    $no_days =~ s/^(\+|-)//;

    print $no_days;
    exit(0);

} else {
    print " [Error in date format] ";
    exit(1);
}

Of course, if you really want to, you can use Math::BigInt as well.


}
}
}TIA,
}
}David
}
}___________________________________________________________
}David Turley
}dturley@illuminet.net
}Fredericksburg, VA
}USA
}
}"If you want to know what God thinks about money, just
}     look at the people He gives it to."
}                                     -- Old Irish Saying
}
}___________________________________________________________

---
Paul J. Schinder
NASA Goddard Space Flight Center
Code 693, Greenbelt, MD 20771
schinder@pjstoaster.pg.md.us



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