Main.cc: In function ‘int main()’:
Main.cc:19:16: error: no match for ‘operator==’ (operand types are ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ and ‘int’)
else if (a == 10) cout << 1873;
~~^~~~~
In file included from /usr/include/c++/7/iosfwd:40:0,
from /usr/include/c++/7/ios:38,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/postypes.h:216:5: note: candidate: template bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
^~~~~~~~
/usr/include/c++/7/bits/postypes.h:216:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::fpos<_StateT>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:64:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_pair.h:448:5: note: candidate: template constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
^~~~~~~~
/usr/include/c++/7/bits/stl_pair.h:448:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::pair<_T1, _T2>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:302:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
operator==(const reverse_iterator<_Iterator>& __x,
^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:302:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:340:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
operator==(const reverse_iterator<_IteratorL>& __x,
^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:340:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note: candidate: template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
operator==(const move_iterator<_IteratorL>& __x,
^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::move_iterator<_IteratorL>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note: candidate: template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
operator==(const move_iterator<_Iterator>& __x,
^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::move_iterator<_IteratorL>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/string:41:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/allocator.h:146:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
operator==(const allocator<_T1>&, const allocator<_T2>&)
^~~~~~~~
/usr/include/c++/7/bits/allocator.h:146:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::allocator<_CharT>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/string:41:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/allocator.h:152:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
operator==(const allocator<_Tp>&, const allocator<_Tp>&)
^~~~~~~~
/usr/include/c++/7/bits/allocator.h:152:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::allocator<_CharT>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/string:52:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/basic_string.h:6009:5: note: candidate: template bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6009:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: mismatched types ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/string:52:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/basic_string.h:6017:5: note: candidate: template typename __gnu_cxx::__enable_if::__value, bool>::__type std::operator==(const std::__cxx11::basic_string<_CharT>&, const std::__cxx11::basic_string<_CharT>&)
operator==(const basic_string<_CharT>& __lhs,
^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6017:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: mismatched types ‘const std::__cxx11::basic_string<_CharT>’ and ‘int’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/string:52:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/basic_string.h:6031:5: note: candidate: template bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
operator==(const _CharT* __lhs,
^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6031:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: mismatched types ‘const _CharT*’ and ‘std::__cxx11::basic_string’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/string:52:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/basic_string.h:6043:5: note: candidate: template bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6043:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: mismatched types ‘const _CharT*’ and ‘int’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/ios_base.h:46:0,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/system_error:292:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
operator==(const error_code& __lhs, const error_code& __rhs) noexcept
^~~~~~~~
/usr/include/c++/7/system_error:292:3: note: no known conversion for argument 1 from ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ to ‘const std::error_code&’
/usr/include/c++/7/system_error:297:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
^~~~~~~~
/usr/include/c++/7/system_error:297:3: note: no known conversion for argument 1 from ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ to ‘const std::error_code&’
/usr/include/c++/7/system_error:304:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
^~~~~~~~
/usr/include/c++/7/system_error:304:3: note: no known conversion for argument 1 from ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ to ‘const std::error_condition&’
/usr/include/c++/7/system_error:311:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
operator==(const error_condition& __lhs,
^~~~~~~~
/usr/include/c++/7/system_error:311:3: note: no known conversion for argument 1 from ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ to ‘const std::error_condition&’
In file included from /usr/include/c++/7/bits/locale_facets.h:48:0,
from /usr/include/c++/7/bits/basic_ios.h:37,
from /usr/include/c++/7/ios:44,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note: candidate: template bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
^~~~~~~~
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/c++allocator.h:33:0,
from /usr/include/c++/7/bits/allocator.h:46,
from /usr/include/c++/7/string:41,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/ext/new_allocator.h:155:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
^~~~~~~~
/usr/include/c++/7/ext/new_allocator.h:155:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const __gnu_cxx::new_allocator<_Tp>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:869:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:869:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’
else if (a == 10) cout << 1873;
^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
from /usr/include/c++/7/bits/char_traits.h:39,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:862:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:862:5: note: template argument deduction/substitution failed:
Main.cc:19:19: note: ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_IteratorL, _Container>’
else if (a == 10) cout << 1873;
^~
Main.cc:8:9: warning: unused variable ‘c’ [-Wunused-variable]
int c;
^