mpf_const_2pi.c

   1 /* LibTomFloat, multiple-precision floating-point library
   2  *
   3  * LibTomFloat is a library that provides multiple-precision
   4  * floating-point artihmetic as well as trigonometric functionality.
   5  *
   6  * This library requires the public domain LibTomMath to be installed.
   7  *
   8  * This library is free for all purposes without any express
   9  * gurantee it works
  10  *
  11  * Tom St Denis, tomstdenis@iahu.ca, http://float.libtomcrypt.org
  12  */
  13 #include <tomfloat.h>
  14
  15 int  mpf_const_2pi(mp_float *a)
  16 {
  17    int err;
  18    if ((err = mpf_const_pi(a)) != MP_OKAY) {
  19       return err;
  20    }
  21    if ((err = mpf_inv(a, a)) != MP_OKAY) {
  22       return err;
  23    }
  24    return mpf_mul_2(a, a);
  25 }
  26                 /* 2/Pi     */
  27