Language: C++

#include<iostream>
using namespace std;
int main(){
  int a, b, k;
  cin >> a >> b;
  if((a + b)%2){
    cout << "IMPOSSIBLE" << endl;
  }else{
    cout << (a+b)>>1 << endl;
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:18: error: no match for 'operator>>' (operand types are 'std::basic_ostream<char>' and 'int')
    9 |     cout << (a+b)>>1 << endl;
      |     ~~~~~~~~~~~~~^~~
      |          |         |
      |          |         int
      |          std::basic_ostream<char>
a.cc:9:18: note: candidate: 'operator>>(int, int)' (built-in)
    9 |     cout << (a+b)>>1 << endl;
      |     ~~~~~~~~~~~~~^~~
a.cc:9:18: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'int'
In file included from /usr/include/c++/14/string:55,
                 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/bits/basic_string.tcc:835:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
  835 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.tcc:835:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
    9 |     cout << (a+b)>>1 << 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:131:5: note: candidate: 'template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator>>(byte, _IntegerType)'
  131 |     operator>>(byte __b, _IntegerType __shift) noexcept
      |     ^~~~~~~~
/usr/include/c++/14/cstddef:131:5: note:   template argument deduction/substitution failed:
a.cc:9:10: note:   cannot convert 'std::cout.std::basic_ostream<char>::operator<<((a + b))' (type 'std::basic_ostream<char>') to type 'std::byte'
    9 |     cout << (a+b)>>1 << endl;
      |     ~~~~~^~~~~~~~
In file included from /usr/include/c++/14/istream:1109,
                 from /usr/include/c++/14/iostream:42:
/usr/include/c++/14/bits/istream.tcc:978:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT&)'
  978 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/usr/include/c++/14/bits/istream.tcc:978:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:849:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char&)'
  849 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/usr/include/c++/14/istream:849:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:854:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char&)'
  854 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/usr/include/c++/14/istream:854:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:896:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT*)'
  896 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/14/istream:896:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:939:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char*)'
  939 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/istream:939:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:945:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char*)'
  945 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/istream:945:5: note:   template argument deduction/substitution failed:
a.cc:9:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:1099:5: note: candidate: 'template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&)'
 1099 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
/usr/include/c++/14/istream:1099:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/istream: In substitution of 'template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::basic_ostream<char>&; _Tp = int]':
a.cc:9:20:   required from here
    9 |     cout << (a+b)>>1 << endl;
      |                    ^
/usr/include/c++/14/istream:1099:5: error: no type named 'type' in 'struct std::enable_if<false, void>'
 1099 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~