/in/foo.cc:2:7: error: expected nested-name-specifier before 'namesopace'
 using namesopace std;
       ^~~~~~~~~~
/in/foo.cc:5:5: error: expected primary-expression before 'int'
     int a,b;
     ^~~
/in/foo.cc:5:5: error: expected '}' before 'int'
/in/foo.cc:6:2: error: 'cin' does not name a type
  cin>>a>>b;
  ^~~
/in/foo.cc:7:2: error: 'cout' does not name a type
  cout<<a+b;
  ^~~~
/in/foo.cc:8:4: error: expected unqualified-id before 'return'
    return 0;
    ^~~~~~
/in/foo.cc:9:1: error: expected declaration before '}' token
 }
 ^