#include <iostream>

using namespace std;

class CBook

{

public:

CBook (double iPage=0);

operator double()

{

return m_iPage;

}

protected:

int m_iPage;

};

CBook:: CBook (double iPage)

{

m_iPage=iPage;

}

void main()

{

CBook bk1(10.0);

CBook bk2(20.00);

cout << "bk1+bk2=" << double(bk1)+double(bk2) << endl;

}

粗体代码中 等于0的意义是什么?

将bk1的实参 10.0传给 iPage 后又等于0  m_iPage又等于iPage

那bk1的m_iPage不就等于0了吗?

还是说只是在创建iPage时为此变量初始化一个值