Language: C++

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
using namespace std;
int a;
int main(){
	cin>>a;
	cout<<a>>1;
}#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
using namespace std;
int a;
int main(){
	cin>>a;
	cout<<(a-1>>1)+1;
}

Compiler output:
a.cc:10:2: error: stray '#' in program
   10 | }#include<iostream>
      |  ^
a.cc: In function 'int main()':
a.cc:9:16: error: no match for 'operator>>' (operand types are 'std::basic_ostream<char>' and 'int')
    9 |         cout<<a>>1;
      |         ~~~~~~~^~~
      |             |    |
      |             |    int
      |             std::basic_ostream<char>
a.cc:9:16: note: candidate: 'operator>>(int, int)' (built-in)
    9 |         cout<<a>>1;
      |         ~~~~~~~^~~
a.cc:9:16: 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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
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:9:13: note:   cannot convert 'std::cout.std::basic_ostream<char>::operator<<(a)' (type 'std::basic_ostream<char>') to type 'std::byte'
    9 |         cout<<a>>1;
      |         ~~~~^~~
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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
/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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
/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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
/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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
/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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
/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:9:18: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
    9 |         cout<<a>>1;
      |                  ^
/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:9:11:   required from here
    9 |         cout<<a>>1;
      |                  ^
/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)
      |     ^~~~~~~~
a.cc: At global scope:
a.cc:10:3: error: 'include' does not name a type
   10 | }#include<iostream>
      |   ^~~~~~~
a.cc:15:5: error: redefinition of 'int a'
   15 | int a;
      |     ^
a.cc:6:5: note: 'int a' previously declared here
    6 | int a;
      |     ^
a.cc:16:5: error: redefinition of 'int main()'
   16 | int main(){
      |     ^~~~
a.cc:7:5: note: 'int main()' previously defined here
    7 | int main(){
      |     ^~~~