Language: C++

#include <bits/stdc++.h>

int main () {
  string s;  cin >> s;
  for (int i = 0; i < s.size(); ++i) {
     if (s[i] == ‘,’) {
        s[i] = “ “;
     }
  }
cout << s << endl;
 return 0;
}

Compiler output:
a.cc:6:18: error: extended character ‘ is not valid in an identifier
    6 |      if (s[i] == ‘,’) {
      |                  ^
a.cc:6:20: error: extended character ’ is not valid in an identifier
    6 |      if (s[i] == ‘,’) {
      |                    ^
a.cc:7:16: error: extended character “ is not valid in an identifier
    7 |         s[i] = “ “;
      |                ^
a.cc:7:18: error: extended character “ is not valid in an identifier
    7 |         s[i] = “ “;
      |                  ^
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;  cin >> s;
      |   ^~~~~~
a.cc:4:3: 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:4:14: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |   string s;  cin >> s;
      |              ^~~
      |              std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:4:21: error: 's' was not declared in this scope
    4 |   string s;  cin >> s;
      |                     ^
a.cc:6:18: error: '\U00002018' was not declared in this scope
    6 |      if (s[i] == ‘,’) {
      |                  ^
a.cc:6:20: error: '\U00002019' was not declared in this scope
    6 |      if (s[i] == ‘,’) {
      |                    ^
a.cc:7:16: error: '\U0000201c' was not declared in this scope
    7 |         s[i] = “ “;
      |                ^
a.cc:10:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 | cout << s << 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:10:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 | cout << s << 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)
      |     ^~~~