小编Som*_*ger的帖子

如何防止C++中的舍入错误或修复它？

例:

float SomeNumber = 999.9999;
cout << SomeNumber << endl;

它打印出1000!

我上课了.

class Books
{
private:
    int m_books;
public:
    Books(int books=0)
    {
        m_books = books;
    }

    Books(const Books &source)  //Here is what I don't understand.
    {
        m_books = source.m_books;
    }
};

我不明白为什么它必须是Books(const Books &source),而不是Books(const Books source).