#!perl

use strict;
use warnings;

use File::Spec::Functions qw/catfile/;
use lib catfile('C:', 'Users', 'home', 'Perl5', 'lib', 'perl5' ) ;
use Time::HiRes qw(gettimeofday tv_interval);
#use Test::More;

#use c_calc;
#use perl_calc;

use Inline C => '<<END_C';

double my_abs(double num)
{
	return (num > 0)? num : -num;
}

double calc_pi()
{
	double real_pi = 3.14159265358979;
	double my_pi = 0;
	double step_sign = 1;
	unsigned long long i = 1;
	while(my_abs(real_pi - my_pi) > 0.00000001)
	{
		my_pi += 4.0/i * step_sign;
		step_sign *= -1;
		i += 2;
	}
	return my_pi;
}

END_C

my $start_time_c = [ gettimeofday ];
my $c_calc = calc_pi(); #c_calc::calc_pi();
my $end_time_c = [ gettimeofday ];
my $elapsed_c = tv_interval($start_time_c,$end_time_c);

my $start_time_perl = [ gettimeofday ];
my $perl_calc = 3.14159 ** 2.71828; #perl_calc::calc_pi();
my $end_time_perl = [ gettimeofday ];
my $elapsed_perl = tv_interval $start_time_perl,$end_time_perl);

my $differences = abs($elapsed_perl - $elapsed_c);

#if(ok($c_calc == $perl_calc, "Pi number calc"))
if($c_calc != $perl_calc)
{
	print "C computation time = $elapsed_c\n";
	print "Perl computation time = $elapsed_perl\n";
	print "Differences = $differences\n";
}

#done_testing;