Returns a random fractional number greater than or equal to
than the value of EXPR. (EXPR should be positive.) If EXPR is
omitted, the value
is used. Currently EXPR with the value
also special-cased as
(this was undocumented before Perl 5.8.0
and is subject to change in future versions of Perl). Automatically calls
srand unless srand has already been
called. See also srand.
returns a random integer between
(Note: If your rand function consistently returns numbers that are too large or too small, then your version of Perl was probably compiled with the wrong number of RANDBITS.)
rand is not cryptographically secure. You should not rely on it in security-sensitive situations. As of this writing, a number of third-party CPAN modules offer random number generators intended by their authors to be cryptographically secure, including: Data::Entropy, Crypt::Random, Math::Random::Secure, and Math::TrulyRandom.