What does ' B*p = new C ' mean?

Question

class A {
public:
void f() {cout << "A";}
};
class B {
public:
void f() {cout << "B";}
};
class C {
public:
void f() {cout << "C";}
};
int main(){
B*p = new C; // what does the ' new C ' mean?
p->f();
}

Answer 1

`new` operator manages pointer types created in heap memory.

But that code won't run because class C is not related to class B. class C should extend class B in order to achieve that.

Answer 2

By default, "new C" means: create an instance of class C and return its pointer in memory.

In fact:
auto p = new C;
p->f();
will print "C"

But you are telling that p must be a pointer to an instance of class B, not C.

As you wrote it, "B *p = new C();" the compiler will give an error: you cannot interchange pointers to different classes.

But if you insist, and use the cast operator, it will work 😉

B *p = (B *)new C;
or
auto p = (B *)new C;

in this case
p->f()
will print "B" !

Answer 3

https://code.sololearn.com/cH6lbu6bP1Jy/?ref=app