foo.cc:20:22: error: stray '\357' in program
   20 |                 num=0；
      |                      ^
foo.cc:20:23: error: stray '\274' in program
   20 |                 num=0；
      |                       ^
foo.cc:20:24: error: stray '\233' in program
   20 |                 num=0；
      |                        ^
foo.cc: In function 'int main()':
foo.cc:20:22: error: expected ';' before '}' token
   20 |                 num=0；
      |                      ^
      |                      ;
   21 |     }
      |     ~                 

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