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#!/usr/bin/perl -w
# test accuracy, precicion and fallback, round_mode
use strict;
use Test;
BEGIN
{
$| = 1;
# chdir 't' if -d 't';
unshift @INC, '../lib'; # for running manually
plan tests => 103;
}
use Math::BigInt;
use Math::BigFloat;
my ($x,$y,$z,$u);
###############################################################################
# test defaults and set/get
ok_undef ($Math::BigInt::accuracy);
ok_undef ($Math::BigInt::precision);
ok ($Math::BigInt::div_scale,40);
ok (Math::BigInt::round_mode(),'even');
ok ($Math::BigInt::rnd_mode,'even');
ok_undef ($Math::BigFloat::accuracy);
ok_undef ($Math::BigFloat::precision);
ok ($Math::BigFloat::div_scale,40);
ok ($Math::BigFloat::rnd_mode,'even');
# accuracy
foreach (qw/5 42 -1 0/)
{
ok ($Math::BigFloat::accuracy = $_,$_);
ok ($Math::BigInt::accuracy = $_,$_);
}
ok_undef ($Math::BigFloat::accuracy = undef);
ok_undef ($Math::BigInt::accuracy = undef);
# precision
foreach (qw/5 42 -1 0/)
{
ok ($Math::BigFloat::precision = $_,$_);
ok ($Math::BigInt::precision = $_,$_);
}
ok_undef ($Math::BigFloat::precision = undef);
ok_undef ($Math::BigInt::precision = undef);
# fallback
foreach (qw/5 42 1/)
{
ok ($Math::BigFloat::div_scale = $_,$_);
ok ($Math::BigInt::div_scale = $_,$_);
}
# illegal values are possible for fallback due to no accessor
# round_mode
foreach (qw/odd even zero trunc +inf -inf/)
{
ok ($Math::BigFloat::rnd_mode = $_,$_);
ok ($Math::BigInt::rnd_mode = $_,$_);
}
$Math::BigFloat::rnd_mode = 4;
ok ($Math::BigFloat::rnd_mode,4);
ok ($Math::BigInt::rnd_mode,'-inf'); # from above
$Math::BigInt::accuracy = undef;
$Math::BigInt::precision = undef;
# local copies
$x = Math::BigFloat->new(123.456);
ok_undef ($x->accuracy());
ok ($x->accuracy(5),5);
ok_undef ($x->accuracy(undef),undef);
ok_undef ($x->precision());
ok ($x->precision(5),5);
ok_undef ($x->precision(undef),undef);
# see if MBF changes MBIs values
ok ($Math::BigInt::accuracy = 42,42);
ok ($Math::BigFloat::accuracy = 64,64);
ok ($Math::BigInt::accuracy,42); # should be still 42
ok ($Math::BigFloat::accuracy,64); # should be still 64
###############################################################################
# see if creating a number under set A or P will round it
$Math::BigInt::accuracy = 4;
$Math::BigInt::precision = 3;
ok (Math::BigInt->new(123456),123500); # with A
$Math::BigInt::accuracy = undef;
ok (Math::BigInt->new(123456),123000); # with P
$Math::BigFloat::accuracy = 4;
$Math::BigFloat::precision = -1;
$Math::BigInt::precision = undef;
ok (Math::BigFloat->new(123.456),123.5); # with A
$Math::BigFloat::accuracy = undef;
ok (Math::BigFloat->new(123.456),123.5); # with P from MBF, not MBI!
$Math::BigFloat::precision = undef;
###############################################################################
# see if setting accuracy/precision actually rounds the number
$x = Math::BigFloat->new(123.456); $x->accuracy(4); ok ($x,123.5);
$x = Math::BigFloat->new(123.456); $x->precision(-2); ok ($x,123.46);
$x = Math::BigInt->new(123456); $x->accuracy(4); ok ($x,123500);
$x = Math::BigInt->new(123456); $x->precision(2); ok ($x,123500);
###############################################################################
# test actual rounding via round()
$x = Math::BigFloat->new(123.456);
ok ($x->copy()->round(5,2),123.46);
ok ($x->copy()->round(4,2),123.5);
ok ($x->copy()->round(undef,-2),123.46);
ok ($x->copy()->round(undef,2),100);
$x = Math::BigFloat->new(123.45000);
ok ($x->copy()->round(undef,-1,'odd'),123.5);
# see if rounding is 'sticky'
$x = Math::BigFloat->new(123.4567);
$y = $x->copy()->bround(); # no-op since nowhere A or P defined
ok ($y,123.4567);
$y = $x->copy()->round(5,2);
ok ($y->accuracy(),5);
ok_undef ($y->precision()); # A has precedence, so P still unset
$y = $x->copy()->round(undef,2);
ok ($y->precision(),2);
ok_undef ($y->accuracy()); # P has precedence, so A still unset
# does copy work?
$x = Math::BigFloat->new(123.456); $x->accuracy(4); $x->precision(2);
$z = $x->copy(); ok ($z->accuracy(),4); ok ($z->precision(),2);
###############################################################################
# test wether operations round properly afterwards
# These tests are not complete, since they do not excercise every "return"
# statement in the op's. But heh, it's better than nothing...
$x = Math::BigFloat->new(123.456);
$y = Math::BigFloat->new(654.321);
$x->{_a} = 5; # $x->accuracy(5) would round $x straightaway
$y->{_a} = 4; # $y->accuracy(4) would round $x straightaway
$z = $x + $y; ok ($z,777.8);
$z = $y - $x; ok ($z,530.9);
$z = $y * $x; ok ($z,80780);
$z = $x ** 2; ok ($z,15241);
$z = $x * $x; ok ($z,15241);
# not yet: $z = -$x; ok ($z,-123.46); ok ($x,123.456);
$z = $x->copy(); $z->{_a} = 2; $z = $z / 2; ok ($z,62);
$x = Math::BigFloat->new(123456); $x->{_a} = 4;
$z = $x->copy; $z++; ok ($z,123500);
$x = Math::BigInt->new(123456);
$y = Math::BigInt->new(654321);
$x->{_a} = 5; # $x->accuracy(5) would round $x straightaway
$y->{_a} = 4; # $y->accuracy(4) would round $x straightaway
$z = $x + $y; ok ($z,777800);
$z = $y - $x; ok ($z,530900);
$z = $y * $x; ok ($z,80780000000);
$z = $x ** 2; ok ($z,15241000000);
# not yet: $z = -$x; ok ($z,-123460); ok ($x,123456);
$z = $x->copy; $z++; ok ($z,123460);
$z = $x->copy(); $z->{_a} = 2; $z = $z / 2; ok ($z,62000);
###############################################################################
# test mixed arguments
$x = Math::BigFloat->new(10);
$u = Math::BigFloat->new(2.5);
$y = Math::BigInt->new(2);
$z = $x + $y; ok ($z,12); ok (ref($z),'Math::BigFloat');
$z = $x / $y; ok ($z,5); ok (ref($z),'Math::BigFloat');
$z = $u * $y; ok ($z,5); ok (ref($z),'Math::BigFloat');
$y = Math::BigInt->new(12345);
$z = $u->copy()->bmul($y,2,0,'odd'); ok ($z,31000);
$z = $u->copy()->bmul($y,3,0,'odd'); ok ($z,30900);
$z = $u->copy()->bmul($y,undef,0,'odd'); ok ($z,30863);
$z = $u->copy()->bmul($y,undef,1,'odd'); ok ($z,30860);
$z = $u->copy()->bmul($y,undef,-1,'odd'); ok ($z,30862.5);
# breakage:
# $z = $y->copy()->bmul($u,2,0,'odd'); ok ($z,31000);
# $z = $y * $u; ok ($z,5); ok (ref($z),'Math::BigInt');
# $z = $y + $x; ok ($z,12); ok (ref($z),'Math::BigInt');
# $z = $y / $x; ok ($z,0); ok (ref($z),'Math::BigInt');
# all done
###############################################################################
# Perl 5.005 does not like ok ($x,undef)
sub ok_undef
{
my $x = shift;
ok (1,1) and return if !defined $x;
ok ($x,'undef');
}
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