Language: C++

#include <bits/stdc++.h>
using namespace std;

int main() {
  string str = "yyyy/mm/dd";
 cin >> "yyyy/mm/dd";
 if ( str.at(0) < 2 ){
 cout << "Heisei" << endl;

 if ( str.at(0) == 2 &&  str.at(1) == 0 && str.at(2) < 1 ){
 cout << "Heisei" << endl;
 
 if (  str.at(0) == 2 &&  str.at(1) == 0 && str.at(2) == 1 && str.at(3) < 9 ){
 cout << "Heisei" << endl;
 
 if ( str.at(0) == 2 &&  str.at(1) == 0 && str.at(2) == 1 && str.at(3) == 9 && str.at(5) == 0 && str.at(6) < 4 ){
 cout << "Heisei" << endl;
 
 if ( str.at(0) == 2 &&  str.at(1) == 0 && str.at(2) == 1 && str.at(3) == 9 && str.at(5) == 0 && str.at(6) == 4 && str.at(8) < 3 ){
 cout << "Heisei" << endl;
 
 if ( str.at(0) == 2 &&  str.at(1) == 0 && str.at(2) == 1 && str.at(3) == 9 && str.at(5) == 0 && str.at(6) == 4 && str.at(8) == 3 && str.at(9) < 1 ){
 cout << "Heisei" << endl;
 }}}}}}
 else {
 cout << "TBD" << endl;
 }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:6: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'const char [11]')
    6 |  cin >> "yyyy/mm/dd";
      |  ~~~ ^~ ~~~~~~~~~~~~
      |  |      |
      |  |      const char [11]
      |  std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'const char*'
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'short int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(short int)((const char*)"yyyy/mm/dd")' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'short unsigned int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(short unsigned int)((const char*)"yyyy/mm/dd")' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(int)((const char*)"yyyy/mm/dd")' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'unsigned int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(unsigned int)((const char*)"yyyy/mm/dd")' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'long int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(long int)((const char*)"yyyy/mm/dd")' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'long unsigned int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(long unsigned int)((const char*)"yyyy/mm/dd")' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'long long int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(long long int)((const char*)"yyyy/mm/dd")' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const char*' to 'long long unsigned int' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
a.cc:6:9: error: cannot bind rvalue '(long long unsigned int)((const char*)"yyyy/mm/dd")' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:9: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
    6 |  cin >> "yyyy/mm/dd";
      |         ^~~~~~~~~~~~
      |         |
      |         const void*
a.cc:6:9: error: cannot bind rvalue '(void*)((const void*)((const char*)"yyyy/mm/dd"))' to 'void*&'
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'const char [11]' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'const char [11]' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'const char [11]' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'const char [11]' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type