Language: C++

#include <iostream>                                                                                    │
using namespace std;                                                                                   │
                                                                                                       │
int main(int argc, char *argv[])                                                                       │
{                                                                                                      │
    int N, A, B;                                                                                       │
                                                                                                       │
        cin >> N;                                                                                      │
        if (N == 1)                                                                                    │
                cout << "Hello World\n";                                                               │
        else if (N == 2) {                                                                             │
                cin >> A >> B;                                                                         │
                cout << A + B << endl;                                                                 │
        }                                                                                              │
                                                                                                       │
        return 0;                                                                                      │
}                

Compiler output:
a.cc:1:104: error: extended character │ is not valid in an identifier
    1 | #include <iostream>                                                                                    │
      |                                                                                                        ^
a.cc:1:104: warning: extra tokens at end of #include directive
    1 | #include <iostream>                                                                                    │
      |                                                                                                        ^
a.cc:2:104: error: extended character │ is not valid in an identifier
    2 | using namespace std;                                                                                   │
      |                                                                                                        ^
a.cc:3:104: error: extended character │ is not valid in an identifier
    3 |                                                                                                        │
      |                                                                                                        ^
a.cc:4:104: error: extended character │ is not valid in an identifier
    4 | int main(int argc, char *argv[])                                                                       │
      |                                                                                                        ^
a.cc:5:104: error: extended character │ is not valid in an identifier
    5 | {                                                                                                      │
      |                                                                                                        ^
a.cc:6:104: error: extended character │ is not valid in an identifier
    6 |     int N, A, B;                                                                                       │
      |                                                                                                        ^
a.cc:7:104: error: extended character │ is not valid in an identifier
    7 |                                                                                                        │
      |                                                                                                        ^
a.cc:8:104: error: extended character │ is not valid in an identifier
    8 |         cin >> N;                                                                                      │
      |                                                                                                        ^
a.cc:9:104: error: extended character │ is not valid in an identifier
    9 |         if (N == 1)                                                                                    │
      |                                                                                                        ^
a.cc:10:104: error: extended character │ is not valid in an identifier
   10 |                 cout << "Hello World\n";                                                               │
      |                                                                                                        ^
a.cc:11:104: error: extended character │ is not valid in an identifier
   11 |         else if (N == 2) {                                                                             │
      |                                                                                                        ^
a.cc:12:104: error: extended character │ is not valid in an identifier
   12 |                 cin >> A >> B;                                                                         │
      |                                                                                                        ^
a.cc:13:104: error: extended character │ is not valid in an identifier
   13 |                 cout << A + B << endl;                                                                 │
      |                                                                                                        ^
a.cc:14:104: error: extended character │ is not valid in an identifier
   14 |         }                                                                                              │
      |                                                                                                        ^
a.cc:15:104: error: extended character │ is not valid in an identifier
   15 |                                                                                                        │
      |                                                                                                        ^
a.cc:16:104: error: extended character │ is not valid in an identifier
   16 |         return 0;                                                                                      │
      |                                                                                                        ^
a.cc:2:104: error: '\U00002502' does not name a type
    2 | using namespace std;                                                                                   │
      |                                                                                                        ^