ln.cpp

浮点数基本运算 浮点数的基本运算主要有四则运算、符号处理、大小比较

#include "../fnexp.hpp"
#include "../fnconst.hpp"

#include <cstdio>
#include <cmath>
using namespace std;

struct t
{
  static const double f_val = 0.234;
};

int main()
{
  printf ("%1.17lf is %1.17lfb%d\n", t::f_val, 
	  btil::fn::fn2em<t, 2>::m::f_val, 
	  btil::fn::fn2em<t, 2>::e);
  printf ("%1.17lf\n", btil::fn::__e::f_val);
  printf ("%1.17lf\n", btil::fn::ln<t>::value::f_val);
  printf ("%1.17lf\n", btil::fn::__ln2::f_val);
  printf ("%1.17lg\n", btil::fn::exp<t>::value::f_val);
  printf ("%1.17lg\n", btil::fn::pow<t, t>::value::f_val);
  printf ("%1.17lg\n", btil::fn::pow_n<t, 20>::value::f_val);
  printf ("%1.17lg\n", btil::fn::sqrt_n<t, 5>::value::f_val);
  printf ("%1.17lg\n", btil::fn::lg<t>::value::f_val);
  printf ("%1.17lf\n", btil::fn::__ln_ten::f_val);
  printf ("%1.17lf\n", btil::fn::__lg_e::f_val);
  printf ("%1.17lf\n", btil::fn::exp<btil::fn::two>::value::f_val);
  printf ("%1.17lf\n", btil::fn::sqrt<t>::value::f_val);
  printf ("%1.17lf\n", btil::fn::pow_kn<2, -4>::value::f_val);

  printf ("---\n");
  printf ("e:\t%1.17lf\n", exp(1.0));
  printf ("ln:\t%1.17lf\n", log(0.234));
  printf ("ln2:\t%1.17lf\n", log(2.0));
  printf ("exp:\t%1.17lf\n", exp(0.234));
  printf ("pow:\t%1.17lf\n", pow(0.234, 0.234));
  printf ("pow:\t%1.17lg\n", pow(0.234, 20));
  printf ("sqrt_n:\t%1.17lf\n", pow(0.234, 0.2));
  printf ("log:\t%1.17lf\n", log10(0.234));
  printf ("ln10:\t%1.17lf\n", log(10.0));
  printf ("loge:\t%1.17lf\n", log10(exp(1.0)));
  printf ("exp2:\t%1.17lf\n", exp(2.0));
  printf ("sqrt:\t%1.17lf\n", sqrt(0.234));
  printf ("pow_kn:\t%1.17lf\n", pow(2.0, -4.0));

  return 0;
}