1 // 1999-11-15 Kevin Ediger  <kediger@licor.com>
2 // test the floating point inserters (facet num_put)
3 
4 // Copyright (C) 1999-2020 Free Software Foundation, Inc.
5 //
6 // This file is part of the GNU ISO C++ Library.  This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
10 // any later version.
11 
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 // GNU General Public License for more details.
16 
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING3.  If not see
19 // <http://www.gnu.org/licenses/>.
20 
21 #include <cstdio> // for sprintf
22 #include <iostream>
23 #include <iomanip>
24 #include <sstream>
25 #include <limits>
26 #include <testsuite_hooks.h>
27 
28 void
test02()29 test02()
30 {
31   using namespace std;
32 
33   // make sure we can output a very long float
34   long double val = numeric_limits<long double>::max();
35   int prec = numeric_limits<long double>::digits10;
36 
37   ostringstream os;
38   os.precision(prec);
39   os.setf(ios::scientific);
40   os << val;
41 
42   char largebuf[512];
43   sprintf(largebuf, "%.*Le", prec, val);
44 #ifdef TEST_NUMPUT_VERBOSE
45   cout << "expect: " << largebuf << endl;
46   cout << "result: " << os.str() << endl;
47 #endif
48   VERIFY( os && os.str() == largebuf );
49 
50   // Make sure we can output a long float in fixed format
51   // without seg-faulting (libstdc++/4402)
52   double val2 = numeric_limits<double>::max();
53 
54   ostringstream os2;
55   os2.precision(3);
56   os2.setf(ios::fixed);
57   os2 << val2;
58 
59   sprintf(largebuf, "%.*f", 3, val2);
60 #ifdef TEST_NUMPUT_VERBOSE
61   cout << "expect: " << largebuf << endl;
62   cout << "result: " << os2.str() << endl;
63 #endif
64   VERIFY( os2 && os2.str() == largebuf );
65 }
66 
67 int
main()68 main()
69 {
70   test02();
71   return 0;
72 }
73