请问媒体报道是指什么？报纸，电视，互联网？ - 未名空间MITBBS历史存档

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请问媒体报道是指什么？报纸，电视，互联网？

请问媒体报道是指什么？报纸，电视，互联网？# Immigration - 落地生根

a*22011-01-11 08:01

1 楼

class A
{
int x;
public:
A(int x_):x(x_){}
int& getX(){return x;}
};
A a1(10);
A a2(10);
int& y = a1.getX();
y = a2.getX();
y = 20;
a1和a2中的结果分别是什么？
第一个改变了
第二个没改变
什么原因？

r*h2011-01-11 08:01

2 楼

什么级别的可以算数？多谢！

l*l2011-01-11 08:01

3 楼

int& y = a1.getX(); this one is reference variable initialization, make y
the reference to a1.x.
y = a2.getX(); is just assignment, make a1.x = a2.x
y = 20; another assignment, make a1.x = 20.

F*n2011-01-11 08:01

4 楼

Printed media(news paper,magazine,book...)
TV or radio need transcript.
什么级别的可以算数？
the circulation of the media is national or internation.

a*22011-01-11 08:01

5 楼

哦，有道理，简单概念没弄清，多谢

【在 l******l 的大作中提到】

: int& y = a1.getX(); this one is reference variable initialization, make y
: the reference to a1.x.
: y = a2.getX(); is just assignment, make a1.x = a2.x
: y = 20; another assignment, make a1.x = 20.

r*y2011-01-11 08:01

6 楼

I think there would have been compiler error here since it is trying
to change a private member through reference.
But I run this and it is ok.
So we can not change a private member directly but we can
change the private member through reference or pointer.

【在 a**********2 的大作中提到】

: class A
: {
: int x;
: public:
: A(int x_):x(x_){}
: int& getX(){return x;}
: };
: A a1(10);
: A a2(10);
: int& y = a1.getX();

m*l2011-01-11 08:01

7 楼

yea, that's why the stupid '&' was invented.
that's the design of C++, encapsulation is to hide code from OTHER code,
not the programmer.
Same logic applies to 'friend'

【在 r*******y 的大作中提到】

: I think there would have been compiler error here since it is trying
: to change a private member through reference.
: But I run this and it is ok.
: So we can not change a private member directly but we can
: change the private member through reference or pointer.

m*l2011-01-11 08:01

8 楼

你试下这个:
class A
{
int x;
public:
A(int x_):x(x_){}
int& getX(){return x;}
};
A a1(11);
A a2(10);
int& y = a1.getX();
cout << y;
y = a2.getX();
cout << y;
y = 20;
cout << y;
看看结果是啥.
y = a2.getX() 是10吗?
is this the case why reference variable can't be reassigned to a new
reference?

【在 a**********2 的大作中提到】

: 哦，有道理，简单概念没弄清，多谢

r*y2011-01-11 08:01

9 楼

I like reference. pointer is too complicated

【在 m********l 的大作中提到】

: yea, that's why the stupid '&' was invented.
: that's the design of C++, encapsulation is to hide code from OTHER code,
: not the programmer.
: Same logic applies to 'friend'