# t/10_dadd.t - dadd tests
#
# Copyright (C) 2017  Patrick McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;
use warnings;

use Test::More;
use Math::Decimal::FastPP;

my @tests;
my $a;
my $b;
my $c;
my $i;

@tests = (
	#    a      b       c
	[ 2   ,  2   ,  "4."  ],
	[ 1   ,  0.23,  "1.23"],
	[ 0.23,  1   ,  "1.23"],
	[ 1   , -1   ,  "0."  ],
	[-1   ,  1   ,  "0."  ],
	[ 1.23,  4.56,  "5.79"],
	[-1.23,  4.56,  "3.33"],
	[-1.23, -4.56, "-5.79"],
	[ 0.1 ,  0.1 ,   ".2" ],
	[-0.1 , -0.1 ,  "-.2" ],
	[ 0.1 , -0.1 ,   ".0" ],
	[-0.1 ,  0.1 ,   ".0" ],
	[ 9.95,  0.52, "10.47"],
);

plan("tests" => scalar(@tests) + 1);

foreach (@tests) {
	($a, $b, $c) = @{$_};
	is(dadd($a, $b), $c, sprintf("%5.2f + %5.2f = %5.2f", $a, $b, $c));
}

$a = 0;
for ($i = 0; $i < 10000; ++$i) {
	$a = dadd($a, 0.01);
}
is($a, "100.00", "adding 0.01 10000 times");
$a = 0;
for ($i = 0; $i < 10000; ++$i) {
	$a += 0.01;
}
note("Using native floating-point arithmetic, the result is " . $a .
	" (should be 100)");