libstdc++-v3/testsuite/18_support/numeric_limits/max_digits10.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-add-options ieee }
   3
   4 // 2010-02-25  Ed Smith-Rowland
   5
   6 // Copyright (C) 2010-2020 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // 18.2.1.1 template class numeric_limits
  24
  25 #include <limits>
  26 #include <cmath>
  27 #include <testsuite_hooks.h>
  28
  29 void
  30 test01()
  31 {
  32   VERIFY( std::numeric_limits<bool>::max_digits10 == 0 );
  33   VERIFY( std::numeric_limits<char>::max_digits10 == 0 );
  34   VERIFY( std::numeric_limits<signed char>::max_digits10 == 0 );
  35   VERIFY( std::numeric_limits<unsigned char>::max_digits10 == 0 );
  36   VERIFY( std::numeric_limits<wchar_t>::max_digits10 == 0 );
  37   VERIFY( std::numeric_limits<short>::max_digits10 == 0 );
  38   VERIFY( std::numeric_limits<unsigned short>::max_digits10 == 0 );
  39   VERIFY( std::numeric_limits<int>::max_digits10 == 0 );
  40   VERIFY( std::numeric_limits<unsigned int>::max_digits10 == 0 );
  41   VERIFY( std::numeric_limits<long>::max_digits10 == 0 );
  42   VERIFY( std::numeric_limits<unsigned long>::max_digits10 == 0 );
  43   VERIFY( std::numeric_limits<long long>::max_digits10 == 0 );
  44   VERIFY( std::numeric_limits<unsigned long long>::max_digits10 == 0 );
  45 #ifdef _GLIBCXX_USE_CHAR8_T
  46   VERIFY( std::numeric_limits<char8_t>::max_digits10 == 0 );
  47 #endif
  48   VERIFY( std::numeric_limits<char16_t>::max_digits10 == 0 );
  49   VERIFY( std::numeric_limits<char32_t>::max_digits10 == 0 );
  50
  51   // GNU Extensions.
  52 #ifdef _GLIBCXX_USE_INT128
  53   VERIFY( std::numeric_limits<__int128>::max_digits10 == 0 );
  54   VERIFY( std::numeric_limits<unsigned __int128>::max_digits10 == 0 );
  55 #endif
  56
  57   const int f_max_digits10 = (2 + std::numeric_limits<float>::digits
  58                               * 643 / 2136);
  59   VERIFY( std::numeric_limits<float>::max_digits10 == f_max_digits10 );
  60
  61   const int d_max_digits10 = (2 + std::numeric_limits<double>::digits
  62                               * 643 / 2136);
  63   VERIFY( std::numeric_limits<double>::max_digits10 == d_max_digits10 );
  64
  65   const int ld_max_digits10 = (2 + std::numeric_limits<long double>::digits
  66                                * 643 / 2136);
  67   VERIFY( std::numeric_limits<long double>::max_digits10 == ld_max_digits10 );
  68 }
  69
  70 int main()
  71 {
  72   test01();
  73   return 0;
  74 }