sebastiannielsen:

About srand:

I dont know if this are updated now, but when I first begun learning perl, I noticed that if I would run 2 instances of a script printing a sequence of random digits, both scripts would show the same sequence if not srand; was runned in the beginning. Therefore, I have get used to srand; in the beginning when Im gonna use rand();

A typical random number generator will generate the same sequence of numbers with the same initial state. It can be a blessing or a curse. Be sure to seed your random number generator when you want individual runs to be different. I typically use time for that.

About repeated calls to rand:

The repeated calls to rand is to force leading zeroes in case I get a number like 000001. Perl would normally strip off all leading zeroes leading to strange filenames.

By calling int(rand(10) repeated times, I guarantee that the resulting number will have this number of digits. So if I would want to generate a 10 digit number, thats ALWAYS 10 digits, even if the number coming out is 1, I would run:

$number = int(rand(10)).int(rand(10)).int(rand(10)).int(rand(10)).int(
+rand(10)).int(rand(10)).int(rand(10)).int(rand(10)).int(rand(10)).int
+(rand(10));

[download]
That would force the number to the string "0000000001" if it gets that number, and not "1".

A simpler method would be:

$number = sprintf "%010u", int(rand(10000000000));

...roboticus

In reply to Re^3: Get CID inline attachments with MIME::Parser by roboticus
in thread Get CID inline attachments with MIME::Parser by sebastiannielsen

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