派生类的派生类的构造函数该如何写？
class A{
public:
A(int a,int b):num(a),sum(b){}
private:
int num,sum;
};
class B : public A
{
public:
B(int a,int b,int c):A(a,b),num(c){}
private:
int num;
}
class C : public A , public B
{
public:
C的构造函数如何书写？
{
public:
A(int a,int b):num(a),sum(b){}
private:
int num,sum;
};
class B : public A
{
public:
B(int a,int b,int c):A(a,b),num(c){}
private:
int num;
}
class C : public A , public B
{
public:
C的构造函数如何书写？
