/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: expected initializer before 'while'
  while(a>0)
  ^~~~~
/in/foo.cc:5:12: warning: unused variable 'a' [-Wunused-variable]
  long long a;
            ^
/in/foo.cc: At global scope:
/in/foo.cc:9:9: error: 'sum' does not name a type
         sum+=a/10;
         ^~~
/in/foo.cc:10:9: error: 'a' does not name a type
         a/o;
         ^
/in/foo.cc:11:9: error: 'cout' does not name a type
         cout<<sum<<endl;
         ^~~~
/in/foo.cc:12:9: error: expected unqualified-id before 'return'
         return 0;
         ^~~~~~