Math::BigRat 0.22

[perl5.git] / lib / bignum.pm

diff --git a/lib/bignum.pm b/lib/bignum.pm
index 5ebb904..9b2ccc9 100644 (file)
--- a/lib/bignum.pm
+++ b/lib/bignum.pm
@@ -4,7 +4,7 @@ use 5.006002;
 $VERSION = '0.22';
 use Exporter;
 @ISA           = qw( bigint );
-@EXPORT_OK     = qw( ); 
+@EXPORT_OK     = qw( PI e bexp bpi ); 
 @EXPORT        = qw( inf NaN ); 
 
 use strict;
@@ -166,7 +166,10 @@ sub import
       splice @a, $j, 1; $j --;
       $oct = \&bigint::_oct_global;
       }
-    else { die "unknown option $_[$i]"; }
+    elsif ($_[$i] !~ /^(PI|e|bexp|bpi)\z/)
+      {
+      die ("unknown option $_[$i]");
+      }
     }
   my $class;
   $_lite = 0;                                  # using M::BI::L ?
@@ -237,6 +240,11 @@ sub import
   }
   }
 
+sub PI () { Math::BigFloat->new('3.141592653589793238462643383279502884197'); }
+sub e () { Math::BigFloat->new('2.718281828459045235360287471352662497757'); }
+sub bpi ($) { Math::BigFloat::bpi(@_); }
+sub bexp ($$) { my $x = Math::BigFloat->new($_[0]); $x->bexp($_[1]); }
+
 1;
 
 __END__
@@ -411,13 +419,13 @@ This will be hopefully fixed soon ;)
 
 =item hex
 
-Override the build-in hex() method with a version that can handle big
+Override the built-in hex() method with a version that can handle big
 integers. Note that under Perl older than v5.9.4, this will be global
 and cannot be disabled with "no bigint;".
 
 =item oct
 
-Override the build-in oct() method with a version that can handle big
+Override the built-in oct() method with a version that can handle big
 integers. Note that under Perl older than v5.9.4, this will be global
 and cannot be disabled with "no bigint;".
 
@@ -488,6 +496,39 @@ handle bareword C<inf> properly.
 A shortcut to return Math::BigInt->bnan(). Useful because Perl does not always
 handle bareword C<NaN> properly.
 
+=item e
+
+       # perl -Mbignum=e -wle 'print e'
+
+Returns Euler's number C<e>, aka exp(1).
+
+=item PI()
+
+       # perl -Mbignum=PI -wle 'print PI'
+
+Returns PI.
+
+=item bexp()
+
+       bexp($power,$accuracy);
+
+Returns Euler's number C<e> raised to the appropriate power, to
+the wanted accuracy.
+
+Example:
+
+       # perl -Mbignum=bexp -wle 'print bexp(1,80)'
+
+=item bpi()
+
+       bpi($accuracy);
+
+Returns PI to the wanted accuracy.
+
+Example:
+
+       # perl -Mbignum=bpi -wle 'print bpi(80)'
+
 =item upgrade()
 
 Return the class that numbers are upgraded to, is in fact returning