libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/wchar_t/5.cc

   1 // Copyright (C) 2005-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 #include <cmath> // for abs
  19 #include <cfloat> // for DBL_EPSILON
  20 #include <sstream>
  21 #include <limits>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test05()
  26 {
  27   using namespace std;
  28
  29   double pi = 3.14159265358979323846;
  30   wostringstream ostr;
  31   ostr.precision(20);
  32   ostr << pi;
  33   wstring sval = ostr.str();
  34   wistringstream istr(sval);
  35   double d;
  36   istr >> d;
  37   VERIFY( abs(pi-d)/pi < DBL_EPSILON );
  38 }
  39
  40 int
  41 main()
  42 {
  43   test05();
  44   return 0;
  45 }