默认构造函数初始化值? [英] does the default constructor initialize values?
问题描述
默认构造函数是否初始化值?
我有一个如下定义的类:
class A
{
int i;
char c;
int * iPtr;
};
默认构造函数是否初始化i,c&的值。 iPtr?
如果是这样,他们每个人初始化的价值是什么?
谢谢。
does the default constructor initialize values?
I have a class as defined below:
class A
{
int i;
char c;
int * iPtr;
};
Does the default constructor initialize the values of i, c & iPtr?
If so, what are the values that they each get initialized to?
thanks.
推荐答案
NewToCPP写道:
NewToCPP wrote:
默认构造函数初始化值?
我有一个课程定义如下:
A级
{
int i;
char c;
int * iPtr;
};
默认构造函数是否初始化i,c&的值。 iPtr?
如果是这样,它们每个初始化的值是多少?
does the default constructor initialize values?
I have a class as defined below:
class A
{
int i;
char c;
int * iPtr;
};
Does the default constructor initialize the values of i, c & iPtr?
If so, what are the values that they each get initialized to?
零初始化它们。
It zero initializes them.
>
谢谢。
>
thanks.
* Noah Roberts:
* Noah Roberts:
NewToCPP写道:
NewToCPP wrote:
>默认构造函数是否初始化值?
我有一个如下定义的类:
A类
{
int i;
char c;
int * iPtr;
};
默认构造函数是否初始化值我,c& iPtr?
如果是这样,他们每个人初始化的价值是什么?
>does the default constructor initialize values?
I have a class as defined below:
class A
{
int i;
char c;
int * iPtr;
};
Does the default constructor initialize the values of i, c & iPtr?
If so, what are the values that they each get initialized to?
零初始化它们。
It zero initializes them.
不,它完全没有(在这个类中)。
int main()
{
A o; //默认构造,o的成员未初始化。
}
-
答:因为它搞砸了人们通常阅读文字的顺序。
问:为什么这么糟糕?
A:热门帖子。
Q :usenet和电子邮件中最烦人的事情是什么?
No, it does exactly nothing (in this class).
int main()
{
A o; // Default-constructed, members of o are not initialized.
}
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
NewToCPP写道:
NewToCPP wrote:
默认构造函数初始化值?
does the default constructor initialize values?
这取决于。
That depends.
我有一个如下定义的课程:
>
A级
{
int i;
char c;
int * iPtr;
};
I have a class as defined below:
class A
{
int i;
char c;
int * iPtr;
};
注意这个类是没用的,因为所有成员都是私有的。
Note that this class is quite useless, because all the members are private.
是否默认构造函数初始化i,c&的值。 IPTR?
Does the default constructor initialize the values of i, c & iPtr?
在这种情况下,编译器将生成默认构造函数。它没有做什么,所以不,这些价值不会被初始化。
In this case, the default constructor will be generated by the compiler. It
does nothing, so no, the values won''t get initialized.
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