Language: C++

#include <iostream>
using namespace std;
  
int main(){
    int a,b;
    cin >> a >> b;
    while (a != 0 && b != 0){
        for(int i = 0; i < a; i++){
            for(int j = 0; j < b; j++){
                cout << "#";
            }
            cout << endl;
        }
        cout  << endl;
        cin >> a >> b;
    }
      
}


Compiler output:
a.cc:3:1: error: extended character   is not valid in an identifier
    3 |   
      | ^
a.cc:3:1: error: extended character   is not valid in an identifier
a.cc:5:1: error: extended character   is not valid in an identifier
    5 |     int a,b;
      | ^
a.cc:5:1: error: extended character   is not valid in an identifier
a.cc:5:1: error: extended character   is not valid in an identifier
a.cc:5:1: error: extended character   is not valid in an identifier
a.cc:6:1: error: extended character   is not valid in an identifier
    6 |     cin >> a >> b;
      | ^
a.cc:6:1: error: extended character   is not valid in an identifier
a.cc:6:1: error: extended character   is not valid in an identifier
a.cc:6:1: error: extended character   is not valid in an identifier
a.cc:7:1: error: extended character   is not valid in an identifier
    7 |     while (a != 0 && b != 0){
      | ^
a.cc:7:1: error: extended character   is not valid in an identifier
a.cc:7:1: error: extended character   is not valid in an identifier
a.cc:7:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
    8 |         for(int i = 0; i < a; i++){
      | ^
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
    9 |             for(int j = 0; j < b; j++){
      | ^
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
   10 |                 cout << "#";
      | ^
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
   11 |             }
      | ^
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
   12 |             cout << endl;
      | ^
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
   13 |         }
      | ^
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
   15 |         cin >> a >> b;
      | ^
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:16:1: error: extended character   is not valid in an identifier
   16 |     }
      | ^
a.cc:16:1: error: extended character   is not valid in an identifier
a.cc:16:1: error: extended character   is not valid in an identifier
a.cc:16:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
   17 |       
      | ^
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:3:1: error: '\U000000a0\U000000a0' does not name a type
    3 |   
      | ^~