C++ (Cpp) mp_int_is_even示例

示例#1

文件： iprime.c 项目： guru2018/IP2Location

/* Find the first apparent prime in ascending order from z */
mp_result mp_int_find_prime(mp_int z)
{
  mp_result  res;

  if(mp_int_is_even(z) && ((res = mp_int_add_value(z, 1, z)) != MP_OK))
    return res;

  while((res = mp_int_is_prime(z)) == MP_FALSE) {
    if((res = mp_int_add_value(z, 2, z)) != MP_OK)
      break;

  }

  return res;
}

示例#2

文件： randprime.c 项目： gale320/imath

mp_result find_prime(mp_int seed, FILE *fb)
{
  mp_result res;
  int       count = 0;

  if(mp_int_is_even(seed))
    if((res = mp_int_add_value(seed, 1, seed)) != MP_OK)
      return res;
  
  while((res = mp_int_is_prime(seed)) == MP_FALSE) {
    ++count;

    if(fb != NULL && (count % 50) == 0)
      fputc('.', fb);

    if((res = mp_int_add_value(seed, 2, seed)) != MP_OK)
      return res;
  }

  if(res == MP_TRUE && fb != NULL)
    fputc('+', fb);
  
  return res;
}