foo.cc: In function 'int main()':
foo.cc:13:21: error: no match for 'operator<<' (operand types are 'std::ios_base&(std::ios_base&)' and 'std::_Setprecision')
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ~~~~~^~~~~~~~~~~~~~~~~
| | |
| | std::_Setprecision
| std::ios_base&(std::ios_base&)
In file included from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/string:53,
from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/locale_classes.h:40,
from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/ios_base.h:41,
from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ios:42,
from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:38,
from iostream:39:
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/basic_string.h:3891:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
3891 | operator<<(basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/basic_string.h:3891:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
In file included from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/ios_base.h:46:
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/system_error:335:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const error_code&)'
335 | operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/system_error:335:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:507:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _CharT)'
507 | operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:507:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:517:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, char)'
517 | operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:517:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:523:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, char)'
523 | operator<<(basic_ostream<char, _Traits>& __out, char __c)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:523:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:534:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, signed char)'
534 | operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:534:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:539:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, unsigned char)'
539 | operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:539:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:598:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const _CharT*)'
598 | operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:598:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
In file included from /nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:833:
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/ostream.tcc:307:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const char*)'
307 | operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/bits/ostream.tcc:307:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:615:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const char*)'
615 | operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:615:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:628:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const signed char*)'
628 | operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:628:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:633:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const unsigned char*)'
633 | operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:633:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:754:5: note: candidate: 'template<class _Ostream, class _Tp> _Ostream&& std::operator<<(_Ostream&&, const _Tp&)'
754 | operator<<(_Ostream&& __os, const _Tp& __x)
| ^~~~~~~~
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:754:5: note: template argument deduction/substitution failed:
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream: In substitution of 'template<class _Ostream, class _Tp> _Ostream&& std::operator<<(_Ostream&&, const _Tp&) [with _Ostream = std::ios_base& (&)(std::ios_base&); _Tp = std::_Setprecision]':
foo.cc:13:37: required from here
/nix/store/hf2gy3km07d5m0p1lwmja0rg9wlnmyr7-gcc-12.3.0/include/c++/12.3.0/ostream:754:5: error: no type named 'type' in 'struct std::enable_if<false, void>'
In file included from foo.cc:2:
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:79:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Resetiosflags)'
79 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:79:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:109:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setiosflags)'
109 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:109:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:143:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setbase)'
143 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:143:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:178:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setfill<_CharT>)'
178 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:178:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:208:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setprecision)'
208 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:208:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:238:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Setw)'
238 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:238:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:311:5: note: candidate: 'template<class _CharT, class _Traits, class _MoneyT> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Put_money<_MoneyT>)'
311 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:311:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:363:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _Put_time<_CharT>)'
363 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_time<_CharT> __f)
| ^~~~~~~~
/nix/store/x8r9w26yn4sfv0qf2i3jhay214dk6895-gcc/include/c++/12.3.0/iomanip:363:5: note: template argument deduction/substitution failed:
foo.cc:13:37: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::ios_base&(std::ios_base&)'
13 | double ans=fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
| ^
240209gj雷宇轩 (2212305雷宇轩) LV 8
undefined
