Language: C++

int main(void)
{ 
  int h, w;
  cin >> h >> w;
   string board[50];
 for (int i = 0;i< h; ++i) cin >> board[i];
 const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1}; 
  
   const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
 for (int i = 0;i< h; ++i) 
 {
   for (int j = 0;j< w; ++j) { 
      if (board[i][j] == ’#’) continue;
          int num = 0; 
     for (int d = 0;d< 8; ++ d) { 
       const int ni = i + dy[d]; 
       const int nj = j + dx[d];
         if (ni < 0 or h <= ni) continue; 
       if (nj < 0 or w <= nj) continue; 
       if (board[ni][nj] == ’#’) num++; 
     }
     board[i][j] = char(num + ’0’);
 
   }
 }
 for (int i = 0;i< h; ++i) cout << board[i] << endl;
 return 0;  }


Compiler output:
a.cc:13:26: error: extended character ’ is not valid in an identifier
   13 |       if (board[i][j] == ’#’) continue;
      |                          ^
a.cc:13:27: error: stray '#' in program
   13 |       if (board[i][j] == ’#’) continue;
      |                           ^
a.cc:13:28: error: extended character ’ is not valid in an identifier
   13 |       if (board[i][j] == ’#’) continue;
      |                            ^
a.cc:20:29: error: extended character ’ is not valid in an identifier
   20 |        if (board[ni][nj] == ’#’) num++;
      |                             ^
a.cc:20:30: error: stray '#' in program
   20 |        if (board[ni][nj] == ’#’) num++;
      |                              ^
a.cc:20:31: error: extended character ’ is not valid in an identifier
   20 |        if (board[ni][nj] == ’#’) num++;
      |                               ^
a.cc:22:31: error: extended character ’ is not valid in an identifier
   22 |      board[i][j] = char(num + ’0’);
      |                               ^
a.cc:22:31: error: extended character ’ is not valid in an identifier
a.cc: In function 'int main()':
a.cc:4:3: error: 'cin' was not declared in this scope
    4 |   cin >> h >> w;
      |   ^~~
a.cc:5:4: error: 'string' was not declared in this scope
    5 |    string board[50];
      |    ^~~~~~
a.cc:6:35: error: 'board' was not declared in this scope
    6 |  for (int i = 0;i< h; ++i) cin >> board[i];
      |                                   ^~~~~
a.cc:13:11: error: 'board' was not declared in this scope
   13 |       if (board[i][j] == ’#’) continue;
      |           ^~~~~
a.cc:13:26: error: '\U00002019' was not declared in this scope
   13 |       if (board[i][j] == ’#’) continue;
      |                          ^
a.cc:13:27: error: expected ')' before '\U00002019'
   13 |       if (board[i][j] == ’#’) continue;
      |          ~                ^~
      |                           )
a.cc:20:12: error: 'board' was not declared in this scope
   20 |        if (board[ni][nj] == ’#’) num++;
      |            ^~~~~
a.cc:20:29: error: '\U00002019' was not declared in this scope
   20 |        if (board[ni][nj] == ’#’) num++;
      |                             ^
a.cc:20:30: error: expected ')' before '\U00002019'
   20 |        if (board[ni][nj] == ’#’) num++;
      |           ~                  ^~
      |                              )
a.cc:22:6: error: 'board' was not declared in this scope
   22 |      board[i][j] = char(num + ’0’);
      |      ^~~~~
a.cc:22:31: error: '\U000020190\U00002019' was not declared in this scope
   22 |      board[i][j] = char(num + ’0’);
      |                               ^~~
a.cc:26:28: error: 'cout' was not declared in this scope
   26 |  for (int i = 0;i< h; ++i) cout << board[i] << endl;
      |                            ^~~~
a.cc:26:36: error: 'board' was not declared in this scope
   26 |  for (int i = 0;i< h; ++i) cout << board[i] << endl;
      |                                    ^~~~~
a.cc:26:48: error: 'endl' was not declared in this scope
   26 |  for (int i = 0;i< h; ++i) cout << board[i] << endl;
      |                                                ^~~~