/in/foo.cc: In function 'int main()':
/in/foo.cc:6:16: error: 'n' was not declared in this scope
    6 |         cin >> n;
      |                ^
/in/foo.cc:9:17: error: 'num' was not declared in this scope; did you mean 'enum'?
    9 |                 num = num+i;
      |                 ^~~
      |                 enum
/in/foo.cc:11:17: error: 'num' was not declared in this scope; did you mean 'enum'?
   11 |         cout << num << endl;
      |                 ^~~
      |                 enum
/in/foo.cc:5:13: warning: unused variable 'n\U0000ff0cnum' [-Wunused-variable]
    5 |         int n，num=0;
      |             ^~~~~~