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PJACKLAM / Math-BigInt-2.005001 / xt / author / bclog10-mbr.t 

            

              
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# -*- mode: perl; -*-
use strict;
use warnings;
use Test::More tests => 4112;
use Scalar::Util qw< refaddr >;
use Math::BigRat;
# ceil(log(x) / log(10)
sub clog10 {
    my $x = shift;
    my $y = int(log($x) / log(10));
    my $trial = 10 ** $y;
    return $y if $trial == $x;
    while ($trial > $x) {
        $y--;
        $trial = 10 ** $y;
    }
    while ($trial < $x) {
        $y++;
        $trial = 10 ** $y;
    }
    return $y;
}
my @cases =
  (
   [ "NaN", "NaN" ],
   [ "-1",  "NaN" ],
   [ "0",  "-inf" ],
  );
for (my $x = 1 ; $x <= 1025 ; $x++) {
    my $y = clog10($x);
    push @cases, [ $x, $y ];
}
note("\nbclog10() as a class method");
for my $case (@cases) {
    my ($test, $y, @y);
    my ($in0, $out0) = @$case;
    # Scalar context.
    $test = qq|\$y = Math::BigRat -> bclog10("$in0");|;
    note "\n", $test, "\n\n";
    eval $test;
    die $@ if $@;
    subtest $test => sub {
        plan tests => 2;
        is(ref($y), 'Math::BigRat', '$y is a Math::BigRat');
        is($y, $out0, 'value of $y');
    };
    # List context.
    $test = qq|\@y = Math::BigRat -> bclog10("$in0");|;
    note "\n", $test, "\n\n";
    eval $test;
    die $@ if $@;
    subtest $test => sub {
        plan tests => 3;
        is(scalar(@y), 1, 'number of output arguments');
        is(ref($y[0]), 'Math::BigRat', '$y[0] is a Math::BigRat');
        is($y[0], $out0, 'value of $y[0]');
    };
}
note("\nbclog10() as an instance method");
for my $case (@cases) {
    my ($test, $x, $y, @y);
    my ($in0, $out0) = @$case;
    # Scalar context.
    $test = qq|\$x = Math::BigRat -> new("$in0"); |
          . qq|\$y = \$x -> bclog10();|;
    note "\n", $test, "\n\n";
    eval $test;
    die $@ if $@;
    subtest $test => sub {
        plan tests => 2;
        is(ref($y), 'Math::BigRat', '$y is a Math::BigRat');
        is($y, $out0, 'value of $y');
    };
    # List context.
    $test = qq|\@y = Math::BigRat -> bclog10("$in0");|;
    note "\n", $test, "\n\n";
    eval $test;
    die $@ if $@;
    subtest $test => sub {
        plan tests => 3;
        is(scalar(@y), 1, 'number of output arguments');
        is(ref($y[0]), 'Math::BigRat', '$y[0] is a Math::BigRat');
        is($y[0], $out0, 'value of $y[0]');
    };
}