gistfile1.txt

[MacBook-Pro-Gregory test]$ clang ya.cpp 
ya.cpp:13:5: error: constructor for 'Bar' must explicitly initialize the base class 'Foo' which does not have a default constructor
    Bar(int j) { i=new char[j]; }
    ^
ya.cpp:1:7: note: 'Foo' declared here
class Foo
      ^
ya.cpp:20:1: error: 'main' must return 'int'
void main()
^
ya.cpp:23:12: error: cannot cast 'Bar' to its private base class 'Foo'
    Foo* b=new Bar(200);
           ^
ya.cpp:10:12: note: implicitly declared private here
class Bar: Foo
           ^~~
3 errors generated.