use Getopt::Long; sub power { return exp( $_[0] ) } sub log2 { return log( $_[0] )/log(2.0) } sub loge { return log( $_[0] ) } sub log10 { return log( $_[0] )/log(10.0) } sub round { my $n = shift; return int($n + 0.5) if ($n >= 0); return int($n - 0.5); } sub trunc { return int($_[0]) } sub f1 { return sprintf "%.1f", $_[0] } sub f2 { return sprintf "%.2f", $_[0] } sub f3 { return sprintf "%.3f", $_[0] } sub f4 { return sprintf "%.4f", $_[0] } sub f5 { return sprintf "%.5f", $_[0] } sub closure { my($sub, $arg) = @_; return sub { $sub->( &$arg ) } } my %opts = map { $_ => 1 } qw( power log2 loge log10 round trunc f1 f2 f3 f4 f5 ); my $func = sub { return shift }; while (my $arg = pop(@ARGV) ) { $arg =~ s/^\-+//; if (defined ($opts{$arg})) { $func = closure( eval '\&' . $arg , $func ); } else { print STDERR "Unknown arg: $arg\n"; } } while ( ) { chop; my @in = split; print shift(@in), " "; print join(" ", map { $func->($_) } @in), "\n"; }