Language: C++

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

int main(){
	char 'alpah';
  cin >> 'alpha';
  
  
  vector<string> cap={"abcdefghijklmnopqrstuvwxyz"};
  vector<string> CAP={"ABCDEFGHIJKLMNOPQRSTUVWXYZ"};
  
  for(int i=0; i<26; i++){
  if('alpha'==cap[i]){
    cout << 'a' << endl;
  }
  else if('alpha'==CAP[i]){
    cout << 'A' << endl;
  }
  }
}


Compiler output:
a.cc:5:14: warning: multi-character literal with 5 characters exceeds 'int' size of 4 bytes
    5 |         char 'alpah';
      |              ^~~~~~~
a.cc:6:10: warning: multi-character literal with 5 characters exceeds 'int' size of 4 bytes
    6 |   cin >> 'alpha';
      |          ^~~~~~~
a.cc:13:6: warning: multi-character literal with 5 characters exceeds 'int' size of 4 bytes
   13 |   if('alpha'==cap[i]){
      |      ^~~~~~~
a.cc:16:11: warning: multi-character literal with 5 characters exceeds 'int' size of 4 bytes
   16 |   else if('alpha'==CAP[i]){
      |           ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:14: error: expected unqualified-id before '\x6c706168'
    5 |         char 'alpah';
      |              ^~~~~~~
a.cc:6:7: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
    6 |   cin >> 'alpha';
      |   ~~~ ^~ ~~~~~~~
      |   |      |
      |   |      int
      |   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:6:10: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: warning: overflow in conversion from 'int' to 'short int' changes value from '1819306081' to '26721' [-Woverflow]
    6 |   cin >> 'alpha';
      |          ^~~~~~~
a.cc:6:10: error: cannot bind non-const lvalue reference of type 'short int&' to a value of type '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:6:10: warning: unsigned conversion from 'int' to 'short unsigned int' changes value from '1819306081' to '26721' [-Woverflow]
    6 |   cin >> 'alpha';
      |          ^~~~~~~
a.cc:6:10: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to a value of type '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:6:10: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: error: cannot bind non-const lvalue reference of type 'unsigned int&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: error: cannot bind non-const lvalue reference of type 'long int&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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>]' (near match)
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:10: error: cannot bind non-const lvalue reference of type 'float&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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>]' (near match)
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:10: error: cannot bind non-const lvalue reference of type 'double&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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>]' (near match)
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:10: error: cannot bind non-const lvalue reference of type 'long double&' to a value of type 'int'
    6 |   cin >> 'alpha';
      |          ^~~~~~~
/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:6:10: error: invalid conversion from 'int' to 'void*' [-fpermissive]
    6 |   cin >> 'alpha';
      |          ^~~~~~~
      |          |
      |          int
a.cc:6:10: error: cannot bind rvalue '(void*)1819306081' to 'void*&'
/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>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:6:10: error: invalid conversion from 'int' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
    6 |   cin >> 'alpha';
      |          ^~~~~~~
      |          |
      |          int
/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 = std::basic_i