What won't these codes run?

Question

I'm trying to find out the reason why these two chunks of code won't run.

Problem 1
========

class A { };
class B : public A{
public:
int x;
B() {
x=10;
}
};
int main(){
A*p;
B d;
p=&d;
cout<<p->x; // Why isn't the output 10?
} // Is it because x MUST be in class A?

Problem 2
========

class A {
};
class B:public A{
};
int main(){
A ob1;
B ob2;
ob2=ob1; // Will this not run because of 1) a lack of constructors or
} 2) it's forbidden to assign to objects?