View Code of Problem 1

#include <iostream>
 
using namespace std;
 
int main() {
  int a, b;
  cin << a << b;
  cout << a+b;
}
/*
Main.cc: In function 'int main()':
Main.cc:7:7: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream<char>}' and 'int')
   cin << a << b;
       ^
Main.cc:7:7: note: candidates are:
In file included from /usr/include/c++/4.9/string:52:0,
                 from /usr/include/c++/4.9/bits/locale_classes.h:40,
                 from /usr/include/c++/4.9/bits/ios_base.h:41,
                 from /usr/include/c++/4.9/ios:42,
                 from /usr/include/c++/4.9/ostream:38,
                 from /usr/include/c++/4.9/iostream:39,
                 from Main.cc:1:
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/4.9/bits/basic_string.h:2772:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:471:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^
/usr/include/c++/4.9/ostream:471:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:476:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:476:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:482:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.9/ostream:482:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:488:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^
/usr/include/c++/4.9/ostream:488:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:493:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^
/usr/include/c++/4.9/ostream:493:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:513:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^
/usr/include/c++/4.9/ostream:513:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/ostream:609:0,
                 from /usr/include/c++/4.9/iostream:39,
                 from Main.cc:1:
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:530:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.9/ostream:530:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:543:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^
/usr/include/c++/4.9/ostream:543:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:548:5: note: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^
/usr/include/c++/4.9/ostream:548:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<char, _Traits>'
   cin << a << b;
          ^
In file included from /usr/include/c++/4.9/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/4.9/ostream:602:5: note: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/4.9/ostream:602:5: note:   template argument deduction/substitution failed:
Main.cc:7:10: note:   'std::istream {aka std::basic_istream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   cin << a << b;
          ^
*/

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