foo.cc:2:20: error: stray '\357' in program
 using namespace std；
                    ^
foo.cc:2:21: error: stray '\274' in program
 using namespace std；
                     ^
foo.cc:2:22: error: stray '\233' in program
 using namespace std；
                      ^
foo.cc:3:1: error: expected ';' before 'int'
 int main()
 ^~~
foo.cc:6:2: error: expected initializer before 'cout'
  cout<<"Hello World!";
  ^~~~
foo.cc:7:2: error: expected unqualified-id before 'return'
  return 0;
  ^~~~~~
foo.cc:8:1: error: expected declaration before '}' token
 }
 ^

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