On Nov 18, 2007 7:32 PM, Thomas F. Droege <[EMAIL PROTECTED]> wrote: > Trying to use floor: snip
The ceil and floor functions are defined in the POSIX module. Read "perldoc -q floor" for more info. #!/usr/bin/perl use strict; use warnings; #don't use -w if you are going to use the warnings pragma, it is redundant use POSIX; #use line terminators, otherwise you might not see the prompt due to buffering print "enter a number to be floored\n"; #define variables as late as possible and avoid initializing them with data #you plan to through away (undef values are very useful in debugging) my $foo = <>; my $goo = floor($foo); print "floor is $goo\n"; snip 0) My first post here - please correct me if I am not using correctly I am an engineer not a professional programmer so please don't tell me you do it just like in c. (an answer I often see in the doc) snip Seems fine to me. snip 1) I suspect a version problem since search indicates floor added after 5.0 How do I ask perl what version is installed? snip Not an version problem, they just aren't exported by default (you need to use the POSIX module), but you can get the version of Perl by saying perl -v The current version is 5.8.8 with 5.10 coming out real soon (5.9, like all odd middle digit version numbers in Perl, is a development version). snip 2) I am running Mandriva 2006 on an Intel 64 bit dual, dual (very nice). Running somewhat older version of Mandriva because I know it's bugs. snip You most likely have a version of 5.8 installed. snip 3) How would I download later version of perl if that is needed? snip In general you should use the package system your OS provides (in Mandriva's case this is RPM/YUM). If you absolutely had to have the latest and greatest version of Perl you could download the source for perl.org and compile it (it is not very difficult), but using the package system is preferable. snip 4) Looking at CPAN I see that math.ops has what I need. How do I add math.ops to my program? I am a real beginner so I would need details. snip I doubt you found a module named math.ops (I don't think it is a valid module name). A quick search on CPAN shows that math.ops is part of Parrot (an experimental virtual machine associated with the equally highly experimental Perl 6) not Perl. If you had found a module that you needed to install (not part of Core Perl like POSIX), you would have had three options (in order of preference): 1. install through your package manager: yum install foo-bar.rpm foo-bar often fits a pattern. Ubuntu's pattern is given Foo::Bar the package name will be libfoo-bar-perl.deb. Mandriva's seems to be something like perl-Foo-Bar-versioninfo.rpm. 2. install using CPAN If you have a recent enough version of Perl you can say: cpan install Foo::Bar otherwise you will have to do it the old school way: perl -MCPAN install Foo::Bar 3. install it manually download the tar ball from cpan.org decompress it change directory into the resulting directory type "perl Makefile.PL" type "make" type "make test" ensure that none of the tests failed type "sudo make install" -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
