Language: C++

#include<iostream>
#include<iomanip>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<cmath>
#include<queue>
#include<stack>
#include<functional>
#include<string>
#include<cstring>
#include <sstream>
using namespace std;
int main(void){
    double a,b,c,d,e,f,x,y;
    while(cin >> a >> b >> c >> d >> e >> f){
        double ad = a / d;
        d *= ad;
        e *= ad;
        f *= ad;
        d -= a;
        e -= b;
        f -= c;
        y = f/e;
        x = (c - b * y)/a;
        y *= 1000;
        y = round(y);
        y /= 1000;
        x *= 1000;
        x = round(x);
        x /= 1000;
        cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
    }
    return 0;
}

Compiler output:
a.cc:32:70: error: stray '\' in program
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                      ^
a.cc: In function 'int main()':
a.cc:32:71: error: expected primary-expression before '?' token
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                       ^
a.cc:32:72: error: expected primary-expression before '?' token
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                        ^
a.cc:32:73: error: expected primary-expression before '?' token
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                         ^
a.cc:32:95: error: no match for 'operator<<' (operand types are 'std::_Setprecision' and 'double')
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                          ~~~~~~~~~~~~~~~~~~~~ ^~ ~
      |                                                                                           |      |
      |                                                                                           |      double
      |                                                                                           std::_Setprecision
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/string_view:763:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, basic_string_view<_CharT, _Traits>)'
  763 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:763:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/bits/basic_string.h:4077:5: 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, _Allocator>&)'
 4077 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4077:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
In file included from /usr/include/c++/14/bits/memory_resource.h:38,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/cstddef:125:5: note: candidate: 'template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator<<(byte, _IntegerType)'
  125 |     operator<<(byte __b, _IntegerType __shift) noexcept
      |     ^~~~~~~~
/usr/include/c++/14/cstddef:125:5: note:   template argument deduction/substitution failed:
a.cc:32:91: note:   cannot convert 'std::setprecision(3)' (type 'std::_Setprecision') to type 'std::byte'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                          ~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/14/bits/ios_base.h:46:
/usr/include/c++/14/system_error:339:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const error_code&)'
  339 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
      |     ^~~~~~~~
/usr/include/c++/14/system_error:339:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:563:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _CharT)'
  563 |     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:563:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:573:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, char)'
  573 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:573:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:579:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, char)'
  579 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:579:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<char, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:590:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, signed char)'
  590 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:590:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<char, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:595:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, unsigned char)'
  595 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:595:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<char, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:654:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const _CharT*)'
  654 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:654:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
In file included from /usr/include/c++/14/ostream:1022:
/usr/include/c++/14/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)
      |     ^~~~~~~~
/usr/include/c++/14/bits/ostream.tcc:307:5: note:   template argument deduction/substitution failed:
a.cc:32:98: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   32 |         cout << fixed << std::setprecision(3) << x << " " << fixed <<\???std::setprecision(3) << y << endl;
      |                                                                                                  ^
/usr/include/c++/14/ostream:671:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::ope