如何初始化父级成员?

class Parent

{
public:
    int member;

    Parent(int m = 0):
        member(m)  // constructor takes an argument, default as 0
    {
    }
};

class Child:
    public Parent
{
public:
    Child():
        Parent(1)  // refer to super class's constructor here
    {

    }
};

class Parent{
private:
    int member;
public:
    Parent():
        member(0){
    }
protected:

    explicit Parent(int x):
        member(x){
    }
};

class Child:
    public Parent {
public:
    Child():
        Parent(1){
    }
};

class Child:
    public Parent
{
public:
    Child()
    {
      member = 1;
    }
};

class Child:
    public Parent
{
public:
    Child():Parent(),member(1)
    {
    }
};

member = 1;

http://www.cplusplus.com/forum/general/29860/