Language: C++

#include <bits/stdc++.h>

int main() {
  int num;
  bool flag = 0;
  string color;
  for(int i == 0; i<num; i++){
    cin >> color;
    if(color == 'Y'){
      bool flag==1;
    }
  }
  if(flag == True){
    cout >> "four" >> endl;
  else cout >> "Three" >> endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'string' was not declared in this scope
    6 |   string color;
      |   ^~~~~~
a.cc:6:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:7:12: error: expected ';' before '==' token
    7 |   for(int i == 0; i<num; i++){
      |            ^~~
      |            ;
a.cc:7:13: error: expected primary-expression before '==' token
    7 |   for(int i == 0; i<num; i++){
      |             ^~
a.cc:7:24: error: expected ')' before ';' token
    7 |   for(int i == 0; i<num; i++){
      |      ~                 ^
      |                        )
a.cc:7:26: error: 'i' was not declared in this scope
    7 |   for(int i == 0; i<num; i++){
      |                          ^
a.cc:13:14: error: 'True' was not declared in this scope
   13 |   if(flag == True){
      |              ^~~~
a.cc:14:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 |     cout >> "four" >> endl;
      |     ^~~~
      |     std::cout
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:14:23: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   14 |     cout >> "four" >> endl;
      |                       ^~~~
      |                       std::endl
In file included from /usr/include/c++/14/istream:41,
                 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:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:15:3: error: expected '}' before 'else'
   15 |   else cout >> "Three" >> endl;
      |   ^~~~
a.cc:13:19: note: to match this '{'
   13 |   if(flag == True){
      |                   ^
a.cc:15:8: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   15 |   else cout >> "Three" >> endl;
      |        ^~~~
      |        std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:15:27: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   15 |   else cout >> "Three" >> endl;
      |                           ^~~~
      |                           std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc: At global scope:
a.cc:17:1: error: expected declaration before '}' token
   17 | }
      | ^