/in/foo.cc:8:13: error: stray '\357' in program
     return 0；
             ^
/in/foo.cc:8:14: error: stray '\274' in program
     return 0；
              ^
/in/foo.cc:8:15: error: stray '\233' in program
     return 0；
               ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>a>>b;
  ^~~
/in/foo.cc:7:2: error: 'cout' was not declared in this scope
  cout<<a+b<<endl
  ^~~~
/in/foo.cc:7:13: error: 'endl' was not declared in this scope
  cout<<a+b<<endl
             ^~~~