CPP
cpp
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#include <iostream>
class A {
public:
int num;
A():num(0) {}
~A() {}
};
class B: public A {
public:
B():num(0) {}
~B() {}
};
class C: public A {
public:
C() {
num = 0;
}
~C() {}
};
int main() {
C c;
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