Language: C++

#include<iostream>
using namespace std;
int main()
{
    int a,b,c;
    int x,y,z;
    cin>>a>>b>>c;
    if(a==b&&b==c)
    {
     x=2*a;
     cout<<x<<endl;
     cout<<"Buying any two "<<x<<"yen."<<endl;
    }

    else if(a!=b!=c)
    {
    x=a+b;
    y=a+c;
    z=b+c;
    cout<<"Buying a "<<a<<"-yen bell and a "<<b<<"-yen bell costs "<<x<<" yen."<<endl;
    cout<<"Buying a "<<a<<"-yen bell and a "<<c<<"-yen bell costs "<<y<<" yen."<<endl;
    cout<<"Buying a "<<b<<"-yen bell and a "<<c<<"-yen bell costs "<<z<<" yen."<<endl;

    if(x<<y&y<<z)
        cout<<"The minimum among these is "<<x<<" yen.";
        else if(y<<x&x<<z)
        cout<<"The minimum among these is "<<y<" yen.";
        else if(z<<x&x<<y)
        cout<<"The minimum among these is "<<z<" yen.";
    }

}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:47: error: no match for 'operator<' (operand types are 'std::basic_ostream<char>' and 'const char [6]')
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
      |                                            |   |
      |                                            |   const char [6]
      |                                            std::basic_ostream<char>
In file included from /usr/include/c++/14/string:48,
                 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/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::pair<_T1, _T2>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'const char*'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3901 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   mismatched types 'const _CharT*' and 'std::basic_ostream<char>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2600:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator<(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2600 |     operator<(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2600:5: note:   template argument deduction/substitution failed:
a.cc:27:48: note:   'std::basic_ostream<char>' is not derived from 'const std::tuple<_UTypes ...>'
   27 |         cout<<"The minimum among these is "<<y<" yen.";
      |                                                ^~~~~~~
In file included from /usr/include/c++/14/bits/ios_base.h:46:
/usr/include/c++/14/system_error:324:3: note: candidate: 'bool std::operator<(const error_code&, const error_code&)'
  324 |   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/14/system_error:324:31: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'const std::error_code&'
  324 |   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
      |             ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/system_error:507:3: note: candidate: 'bool std::operator<(const error_condition&, const error_condition&)'
  507 |   operator<(const error_condition& __lhs,
      |   ^~~~~~~~
/usr/include/c++/14/system_error:507:36: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'const std::error_condition&'
  507 |   operator<(const error_condition& __lhs,
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
a.cc:29:47: error: no match for 'operator<' (operand types are 'std::basic_ostream<char>' and 'const char [6]')
   29 |         cout<<"The minimum among these is "<<z<" yen.";
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
      |                                            |   |
      |                                            |   const char [6]
      |                                            std::basic_ostream<char>
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'templa