/in/foo.cc: In function 'int main()':
/in/foo.cc:5:7: error: 'a' was not declared in this scope
  cin>>a>>b>>c;
       ^
/in/foo.cc:5:10: error: 'b' was not declared in this scope
  cin>>a>>b>>c;
          ^
/in/foo.cc:5:13: error: 'c' was not declared in this scope
  cin>>a>>b>>c;
             ^