new A 与 new A()的区别-CSDN论坛

论坛帮助

CSDN论坛 > C/C++ > C++ 语言

new A 与 new A()的区别 [问题点数：30分，结帖人Arthas102]

class A
{
...//省略
}

void main()
{
A* p = NULL;
//以下这两种方式有什么区别？请用一个实际的代码例子说明，谢谢！
p = new A;
p = new A();
}

0 2008-11-08 18:01:35

回复数 7 只看楼主引用举报楼主

glacier3d 本版专家分：1123: 有区别吗？没有吧

0 2008-11-08 18:08:15

只看TA 引用举报 #1 得分 0

A *a=new(A)与A *a=new A的区别 #include "stdafx.h"rn#includernclass Arnrn int a;rn int b;rnpublic:rn int sum(int a,int b)rn rn return a+b;rn rn;rnint main(int argc, char* argv[])rnrn A *a=new(A);rn int c;rn c=a->sum(3,6);rn printf("%d",c);rn delete a;rn return 0;rnrnrnrn#include "stdafx.h"rn#includernclass Arnrn int a;rn int b;rnpublic:rn int sum(int a,int b)rn rn return a+b;rn rn;rnint main(int argc, char* argv[])rnrn A *a=new(A);rn int c;rn c=a->sum(3,6);rn printf("%d",c);rn delete a;rn return 0;rnrn

zgy1353246 本版专家分：129: 看不出区别，等待高手！！！！

0 2008-11-08 18:10:54

只看TA 引用举报 #2 得分 0

$a=new A 和 $a= & new A 到底有没有区别？ $a=new A; // $a 是 new A 的指针的一个拷贝（ $a 保存的是指针本身)rnrnrn$a=& new A; // $a 是 new A 的指针的一个引用 ( $a 保存的是指针的地址)rnrnrn以上说法正确吗？rnrnrn另外:rnrn$c= & $a 的时候，为什么会把 $a 也变成了 A 的指针的引用？rnrn

⋅求助高手，一个矩阵相关的问题 ⋅从Excel表格中获取图片，崩溃了 ⋅MFC中如何将BYTE颜色数组显示出来？ 更多帖子 关注私聊空间博客 Arthas102 本版专家分：51: 引用 1 楼 glacier3d 的回复:
有区别吗？没有吧

就是不知道有没有区别才问的阿

0 2008-11-08 18:11:34

只看TA 引用举报 #3 得分 0

new abc() 和 abc a = new() 的区别 1 new abc()是创建个临时对象吗？rnrn2 如果abc类是个窗体类 abc a = new() 后面需要 a.showwindow() 那用 new abc()时该怎么写showwindow()函数？rn 是在abc的构造函数中写吗？rnrn3 这两种方法各自的优势是什么，一般用在什么地方？rnrn

⋅ACM 1002 究竟错在哪里了？求指点 ⋅搞嵌入式Linux和Vxworks的在上海的相关公司多吗？ ⋅弱问：Checksum的真正作用有那么强大吗？ 更多帖子 关注私聊空间博客 giant1st 本版专家分：1228: A 是一个 Class，权且就当 int 也是个特殊的Class为例，
p = new A;    （1）
p = new A();   （2）
后面的仅仅是多了个初始化，如果有默认构造函数，（1）就会自己初始化
（2）是按自己的意愿来初始化，括号中为初始化的值
new int 的话，会将p所指向的int初始化为0

0 2008-11-08 18:14:29

只看TA 引用举报 #4    得分 10

A extends B B a = new A()与A a = new A（）区别？他们在调用属性或者方法时有区别么？

⋅散分，缅怀上海帮各只猪头 ⋅散分，缅怀上海帮各只猪头 ⋅兄弟们，新年爽歪歪 更多帖子 关注私聊空间博客 R9R9R9 本版专家分：1363



class foo

{

public:

    int val;

};







int main( void )

{





    foo* p1 = new foo();

    foo* p2 = new foo;



    cout << p1->val << endl; // val被初始化为int()，即0

    cout << p2->val << endl; // val为随机值



    return 0;

}

0 2008-11-08 18:14:36

只看TA 引用举报 #5 得分 20

⋅散分，缅怀上海帮各只猪头 ⋅散分，缅怀上海帮各只猪头 ⋅兄弟们，新年爽歪歪 更多帖子 关注私聊空间博客 R9R9R9 本版专家分：1363: 具体的看C++标准的规定吧

ISO/IEC 14882:2003(E) 中 5.3.4 之 15
— If the new-initializer is omitted:
    — If T is a (possibly cv-qualified) non-POD class type (or array thereof), the object is default-initialized(8.5). If T is a const-qualified type, the underlying class type shall have a user-declared default constructor.
    — Otherwise, the object created has indeterminate value. If T is a const-qualified type, or a (possibly cv-qualified) POD class type (or array thereof) containing (directly or indirectly) a member of const-qualified type, the program is ill-formed;
— If the new-initializer is of the form (), the item is value-initialized (8.5);

0 2008-11-08 18:15:12

只看TA 引用举报 #6    得分 0

a=new A;和a=new A();有什么区别？ -

Arthas102 本版专家分：51: 这标准的英文还真是难以看懂啊

0 2008-11-08 18:22:57

只看TA 引用举报 #7 得分 0

new a与new a()有什么区别 new a与new a()有什么区别今天突然发现一个问题，特此记录一下。动态分配了一个类的对象，但是后面加了个括号。 QSerialPort* serial = new QSerialPort; 问题来了，平时动态分配内存的时候只需要这样写就可以 int * a = new int; 那么类名后面的括号是啥意思呢？果断写了个超级简单的类，让计算机告诉我们这俩货差别在哪。 typed...

收藏帖子

new A()和new A 有什么区别？: 类A；rnrnrnnew A()和new A 有什么区别？

new String("a");的区别是什么？">String a="a";和String a=new String("a");的区别是什么？: rnrt

B继承于A，A a=new B()与B a=new B()区别: 如题，不一样吧？有哪方面的区别?rn

A a=new B()问题: A是基类，B是派生类rn然后A a=new B();rn按照我的理解：在内存中创造了一个B对象，然后把此对象的地址赋给变量a（因为a是引用类型，所以应该接收的是一个地址）rnrn为什么a不能访问派生类B中增加的成员呢？

A a和A a()是一样的么？new A 和 new A()是一样的么？: class Arnrn public:rn A();rn;rnA::A()rnrn ......rnrnrnA a 和 A a()是一样的么？rnnew A 和 new A()是一样的么？rn

A a=new A()和A* a=new A() 这两句代码意义意义吗？: 类ArnrnA a=new A()rn和rnA* a=new A()rnrn结果的a都可以使用。他们有什么区别啊！

关于 A a=(A)(new B()): using System;rnusing System.Collections.Generic;rnusing System.Text;rnrnnamespace ConsoleApplication1rnrn public class Arn rn public virtual void MethodA()rn rn Console.WriteLine("A.MethodA");rn rnrn public void MethodB()rn rn Console.WriteLine("A.MethodB");rn rn rnrn public class B : Arn rn public override void MethodA()rn rn // base.MethodA();rn Console.WriteLine("B.MethodA");rn rnrn public new void MethodB()rn rn Console.WriteLine("B.MethodB");rn rn rnrn class Programrn rn static void Main(string[] args)rn rn A A1 = new B();rn A1.MethodA();rn A1.MethodB();rn B B1 = new B();rn B1.MethodA();rn B1.MethodB();rn rn rn

dim a as new xx 和 dim a as xx set a=new xx 区别: dim a as new xx rn和 rndim a as xx rnset a=new xx rn区别

请教大家B *p=(A *)new A 和 B *p=new A区别: class Arnrn public A()cout<<

A New Change Problem: Problem DescriptionnNow given two kinds of coins A and B,which satisfy that GCD(A,B)=1.Here you can assume that there are enough coins for both kinds.Please calculate the maximal value that you cannot pay and the total number that you cannot pay.n nnInputnThe input will consist of a series of pairs of integers A and B, separated by a space, one pair of integers per line. n nnOutputnFor each pair of input integers A and B you should output the the maximal value that you cannot pay and the total number that you cannot pay, and with one line of output for each line in input.n nnSample Inputn2 3n3 4n nnSample Outputn1 1n5 3

A New Growth Industry: A biologist experimenting with DNA modification of bacteria has found a way to make bacterial colonies sensitive to the nsurrounding population density. By changing the DNA, he is able to "program" the bacteria to respond to the varying densities in their immediate neighborhood. nnThe culture dish is a square, divided into 400 smaller squares (20x20). Population in each small square is measured on a four point scale (from 0 to 3). The DNA information is represented as an array D, indexed from 0 to 15, of integer values and is interpreted as follows: nnIn any given culture dish square, let K be the sum of that square's density and the densities of the four squares immediately to the left, right, above and below that square (squares outside the dish are considered to have density 0). Then, by the next day, that dish square's density will change by D[K] (which may be a positive, negative, or zero value). The total density cannot, however, exceed 3 nor drop below 0. nnNow, clearly, some DNA programs cause all the bacteria to die off (e.g., [-3, -3, ..., -3]). Others result in immediate population explosions (e.g., [3,3,3, ..., 3]), and others are just plain boring (e.g., [0, 0, ... 0]). The biologist is interested in how some of the less obvious DNA programs might behave. nnWrite a program to simulate the culture growth, reading in the number of days to be simulated, the DNA rules, and the initial population densities of the dish. nnnInput Format: nnInput to this program consists of three parts: nn1. The first line will contain a single integer denoting the number of days to be simulated. nn2. The second line will contain the DNA rule D as 16 integer values, ordered from D[0] to D[15], separated from one another by one or more blanks. Each integer will be in the range -3...3, inclusive. nn3. The remaining twenty lines of input will describe the initial population density in the culture dish. Each line describes one row of squares in the culture dish, and will contain 20 integers in the range 0...3, separated from one another by 1 or more blanks.nnnOutput Format: nnThe program will produce exactly 20 lines of output, describing the population densities in the culture dish at the end of the simulation. Each line represents a row of squares in the culture dish, and will consist of 20 characters, plus the usual end-of-line terminator. nnEach character will represent the population density at a single dish square, as follows:nnnNo other characters may appear in the output. nnThis problem contains multiple test cases!nnThe first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.nnThe output format consists of N output blocks. There is a blank line between output blocks.nnnSample Input:nn1n2n0 1 1 1 2 1 0 -1 -1 -1 -2 -2 -3 -3 -3 -3n3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0n0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0nnSample Output:nn##!.................n#!..................n!...................n....................n....................n....................n....................n.........!..........n........!#!.........n.......!#X#!........n........!#!.........n.........!..........n....................n....................n....................n....................n....................n....................n....................n....................

A New Algorithm for FDTD: TDTD文献，很好的东西，大家可以看看，时域有限差分法

A a = new A()和A a = new B()生成的引用对象有什么区别??: A a = new A()和A a = new B()生成的引用对象有什么区别??

A New C Compiler: This paper describes yet another series of C compilers. These compilers were developed over the last several years and are now in use on Plan 9. These compilers are experimental in nature and were developed to try out new ideas. Some of the ideas were good and some not so good.

a new one for you: it's need password ?? i don't know guess

移动前端，a new beginning: csdn前一阵子老是登陆不上去，最后才发现原来是被盗号，发了垃圾博客，被管理员关掉了。现在终于又回来了。这一次，是真的要继续写博客了。今天刚办完了离职手续，从毕业就在这家公司，工作了三年了，因为公司网络禁止的严格，在公司没法写博客，回家又累的不想写，于是就把这里荒废了。明天就要去新公司报道了，这个公司很open，都是用的自己的电脑，当然网络也不会限制。所以，以后我会有时间继续写博客的。也是

Object a=new Object();: a本身只是一个变量，位于线程堆栈中，rn而a引用的实例位于托管堆中是吧？

IDR_MAINFRAME is a new resource: 删除.CLW文件后重新加载class Wizard之后, 再从IDR_MAINFRAME中某个子菜单进入class Wizard就出现了rnIDR_MAINFRAME is a new resource....rnrn请问有没有什么办法解决呢？会不会对程序以后有什么影响啊

a new website , welcome!!: thp.6to23.com, welcome!!!!

add a new application: We want to build a multimedia application that runs over a UDP connection, which simulates the behavior of an imaginary multimedia application that implements "five rate media scaling" that can respond to network congestion to some extent by changing encoding and transmission policy pairs associated with scale parameter values.

string a = new string();: string a = new string();rn报错：string没有无参构造函数rnstring a = new string("fgfg");rn为什么还报错？rn而且我在有些资料上看到过string a = new string("fgfg");的写法rn

接口 a = new 实例: 比如：rn[code=Java]rnList list= new ArrayList();rn[/code]rnrnrn我知道都这样写，就是不知道有什么好处呢？rnrn转换？rnrn高手指教下，多谢[img=https://forum.csdn.net/PointForum/ui/scripts/csdn/Plugin/003/onion/17.gif][/img]

new String("a")问题: 刚刚看了scjp教程和论坛上面很多贴讨论String s="a"和String s = new String("a")的区别。感觉还是有点疑问，提出来希望各位不要见怪。rnrn=====================================================rnString b1 = "b"; rnString b2 = new String("b");rnSystem.out.println(b1 == b2);rnrnString s1 = new String("a");rnString s2 = "a";rnSystem.out.println(s1 == s2);rn=====================================================rn结果是：rnfalsernfalsernrn第一部分可以理解，没有问题。但是第二部分还是不能理解:rnrnSCJP教程中提到 String s1 = new String("a"); 这种方式会创建两个对象，其中一个对象创建好马上被抛弃，而另一个对象在池中。此时s1指向池中的对象。接下来执行String s2 = "a"; 因为池已经有"a"这个对象了，所以，s2也指向"a"。那 (s1==s2)应该返回true.rnrn不知道我的理解哪里有问题？rn

a new kind of science: Mathematica 软件的缔造者S.Wolfram最引以为傲的一本书，主要阐述了他的数学建模思想，提出了细胞机的概念

A New Kind of Science: A New Kind of Science

A New Kind of Chess: DescriptionnnPrince Remmarguts met Uyuw successfully in our previous story, and after that Princess Uyuw introduced a new kind of chess to Remmarguts named Nixgnauhc. The only chessman allowed in it was a special type of Knight. nnThe chessboard is of (N + 1) * (M + 1). Each of the rows and columns are numbered as the following graph: nn![](http://poj.org/images/2450_1.jpg)nHere N + 1 = 5 + 1 is the number of rows and M + 1 = 4 + 1 is the number of columns. We are also given two integer numbers P and Q, and told that at the beginning of the game, the blocks of (x, y) - (row number, column number) - where x < N, 0 < M, 1<= 100. nnEach of the following lines denotes a single test case, consisting of 8 integers N, M, P, Q, a, b, c, and d. The meanings of such integers are described above.nOutputnnOutput one line per test case, showing the total possibilities of games. We guarantee this number is less than 10^500.nSample Inputnn2n3 3 0 0 1 1 1 1n5 4 2 1 1 1 2 1nSample Outputnn8n7

A new Algorithm: 一种自己写的最优值求解算法，计算还是比较快的，求局部或全局最优值的一种算法。

A new review of statistics: A very basic stats book.

a new world 技术文档: 包含：数据结构课件(修订版).rar 数据挖掘基础课件.zip 量化交易课件.zip 机器学习课件.zip

A New Year: 新的一年到了，小弟在这里祝所有的perl爱好者新年快乐，万事如意，心想事成。rn 这点分算是给大家的新年礼物！rn （我知道这篇帖子有点跑题，还请小肯哥手下留情）。

A New Tetris Game: Problem Descriptionn曾经，Lele和他姐姐最喜欢，玩得最久的游戏就是俄罗斯方块(Tetris)了。n渐渐得，Lele发觉，玩这个游戏只需要手快而已，几乎不用经过大脑思考。n所以，Lele想出一个新的玩法。nnLele和姐姐先拿出一块长方形的棋盘，这个棋盘有些格子是不可用的，剩下的都是可用的。Lele和姐姐拿出俄罗斯方块里的正方形方块(大小为2*2的正方形方块)轮流往棋盘里放，要注意的是，放进去的正方形方块不能叠在棋盘不可用的格子上，也不能叠在已经放了的正方形方块上。n到最后，谁不能再放正方形方块，谁就输了。nn现在，假设每次Lele和姐姐都很聪明，都能按最优策略放正方形，并且每次都是Lele先放正方形，你能告诉他他是否一定能赢姐姐吗？n nnInputn本题目包含多组测试，请处理到文件结束。n每组测试第一行包含两个正整数N和M(0

Conquer a New Region: Problem DescriptionnThe wheel of the history rolling forward, our king conquered a new region in a distant continent.nThere are N towns (numbered from 1 to N) in this region connected by several roads. It's confirmed that there is exact one route between any two towns. Traffic is important while controlled colonies are far away from the local country. We define the capacity C(i, j) of a road indicating it is allowed to transport at most C(i, j) goods between town i and town j if there is a road between them. And for a route between i and j, we define a value S(i, j) indicating the maximum traffic capacity between i and j which is equal to the minimum capacity of the roads on the route. nOur king wants to select a center town to restore his war-resources in which the total traffic capacities from the center to the other N - 1 towns is maximized. Now, you, the best programmer in the kingdom, should help our king to select this center.n nnInputnThere are multiple test cases.nThe first line of each case contains an integer N. (1 <= 100,000)n nnOutputnFor each test case, output an integer indicating the total traffic capacity of the chosen center town.n nnSample Inputn4n1 2 2n2 4 1n2 3 1n4n1 2 1n2 4 1n2 3 1n nnSample Outputn4n3n

A New Joseph Problem: 问题描述 :nnnnNewman and Bamboo are good friends. One day, Newman taught Bamboo the famous Joseph Problem: there are N persons numbered 1 to N standing round a circle. They stand clockwise according to their numbers (namely 1, 2, 3, 4, …, N). Then, starting from 1, the killer kills every 2nd person he counts until there is only one person left whose number is J(N). We can easily infer that J(1) = 1, J(5) = 3 and J(6) = 5. Bamboo finds this problem intriguing and starts thinking. Suddenly, he finds that if he continually uses J(N) to be the term in J, he can finally get a fixed number. For example, J(2) = 1, so J(J(2)) = 1, J(J(…J(2)…)) = 1. Newman agrees with Bamboo but Bamboo is not satisfied. Furthermore, Bamboo wants to know what the fixed number will be for a specific N. Can you help us?nnn nn输入:nnnnOnly one line containing n (1 ≤ n ≤ 1010000).nnn nn输出:nnnnOnly one line containing K such that J(J(J(J…J(N)…))) = K and J(K)=K.nnn样例输入:nn10n样例输出:nn3

A New kind of Science: A New kind of Science是对人工智能新想法、新理念的探讨。

区别？">New Char() "a", "b",与 New [Char]() "a", "b"有什么区别？: 这是MSDN上的例子，觉得很奇怪，new [Char],多了个[]是什么意思？rnPublic Shared Sub Main()rn Dim words As String = "this is a list of words, with: a bit of punctuation."rn Dim split As String() = words.Split(New [Char]() " "c, ","c, "."c, ":"c)rn rn Dim s As Stringrn For Each s In splitrn If s.Trim() <> "" Thenrn rn Console.WriteLine(s)rn End Ifrn Next srn End Sub 'MainrnEnd Class 'SplitTestrnrnrn

A aa = new B()与(A)new B()是一样的吗？: 请教各位朋友rnA是B的父类那么rnA aa = new B()rn与(A)new B()rn是一样的吗？

请问$a = new oneclass;和$a =& new oneclass;有什么区别: 如题目。今天看到这个用法。rnrn这么做是不是可以节省内存空间？

A New Computer Architecture Using a New Program Driving Method: 一个程序指令的相互依赖往往限制了可以利用的并行处理。在另一方面，不同程序指令间的依赖越少，和并行越容易实现。但是，传统的处理器都使用“硬件电脑+ ”驱动程序运行，这是无法运行多个程序在单一内核处理器的同时，并因此无法开发并行程序的指令。本文提出了一种新型的计算机处理器（称为并行多个程式处理器CMPP）架构使用一种新的驱动方法，程序可以运行多个程序在单一内核处理器的同时，而不使用中断技术。新的驱动方法的主要的思路，是提取所有程序/指令驱动内容/因素，形成推动载体，简称为计划驱动矢量（ PDV ）或程序驱动器（ PD ），因此，许多综合布线系统可以驱动多程序执行。

新手求教，A类，A a;和A a=new A;，有啥区别？: class A;rn......;rnint main()rnrn A a;rn A b=new A;rn return 0;rnrn对象a和对象b有什么区别呢？rn

A a = new A(); a.method(); 和 IA a = new A(); a.method();两者在jvm里运行时有何区别: 难道是在方法的寻址过程，性能上？

new、new()和new[]三者的区别: new、new()和new[]三者的区别最近写程序,遇到了new, new()和new[]的三种情况,一时间有点混乱,因此总结如下: 1.new和new() new A 来创建一个不确定值的对象或实例,new() 创建一个值为零的对象或实例.而new(X),用于创建一个被初始化为X的对象或实例. 2.new和new[] new 用于单个对象或者实例的创建,就是调用类的构造函数 n

int *a=11和int *a=new int(11)区别: 如题，求大神帮忙看下啊啊啊啊啊啊啊啊啊啊

java 对象实例化是否都得NEW一下，譬如A a; a = new A;: rn 谢谢

js中的var a = new A;与var a = new A();有什么区别？: js中的var a = new A;与var a = new A();有什么区别？rn加不加()有什么不同吗

A a = new B()与A b = new A()是一样的吗？: rnrnclass A rn int item;rn int a_item;rnrn public void h()rn System.out.println("aaa.h()");rn rn public void f() rn System.out.println("aaa.f()");rn rnrnrnclass B extends A rn int item;rn int b_item;rnrn public void f() rn System.out.println("bbb.f()");rn rn public void k()rn System.out.println("bbb.k()");rn rnrnrnpublic class Test2 rnrn public static void main(String[] args) rn A a = new B();rn A b = new A();rnrn rnrnrn程序如上，a和b所能调用的属性和方法都是一样的，rn是不是a和b就是一样？rn它们有不一样的地方吗？rn

var a = new A();和var a = ;A.call(a);一样吗？: 我觉得rn[code=JScript]var a = new A();[/code]rn和rn[code=JScript]var a = ;rnA.call(a);[/code]rn是完全相同的。

A a=new B()"的确切内涵.">请教"A a=new B()"的确切内涵.: 先请看这段程序:rnrnusing System;rnclass Arnrnpublic void F()rnConsole.WriteLine("A.F");rnpublic virtual void G()rnConsole.WriteLine("A.G");rnrnclass B:Arnrnnew public void F()rnConsole.WriteLine("B.F");rnpublic override void G()rnConsole.WriteLine("B.G");rnrnclass Testrnrnstatic void Main()rnrnB b=new B();//rnA a=b;//rna.F();rnb.F();rna.G();rnb.G();rnConsole.ReadLine();rnrnrnrn它的运行结果是:rnrnA.F()rnB.F()rnB.G()rnB.G()rnrn这里想向各位高手请教的,是上面用"//"标记的这二句: "B b=new B(); A a=b;"rn对于 "A a=b;" 其中的"a"按说是属于"A"的类型,当被赋予一个"b"的实例后,rn到底出现了什么变化,当"a"调用"F()"时是调用"A"的F(),而不是被"B"改写的"F()";当"a"调用"G()"时是调用"B"重载的"G()",而不是"A"本身的"G()"?rn问题的焦点在于 "A a=new B()" 的机理是什么,从而导致上述结果?

“A a = new B();”怎么解释？: 前提：A是B的父类。rn这样写的目的是什么？a的类型肯定是A，但它拥有哪些A、B的哪些变量和函数？rn还有，interface中的方法内容一定为空吗？rn谢谢。

e.options.add(new Option(a[i], a[i]): e.options.add(new Option(a[i], a[i])rnrn涵数add(),Option()是jscript涵数吗?他们是如何使用的,在哪可以找到它们的用法呢,谢谢!

A a = new B();哪位给讲讲: class Class1rn rn /// rn /// 应用程序的主入口点。rn /// rn [STAThread]rn static void Main(string[] args)rn rn //rn // TODO: 在此处添加代码以启动应用程序rn //rn A a = new B();rn a.name();rn Console.ReadLine();rn rn rn public class Arn rn public A()rn rn Console.WriteLine("aa");rn rn public virtual void name()rn rn Console.WriteLine("aname");rn rn rn public class B:Arn rn public B()rn rn Console.WriteLine("bb");rn rn public override void name()rn rn Console.WriteLine("bname");rn rn rnrn输出结果：rnaarnbbrnbnamernrn为什么会输出aa？那位给讲讲执行原理，

How to new a console application a JB?: who can tell me the steps?rnbow to u!

A a = new B(); 理解意义。: public abstract class A rn rn public A() rn rn Console.WriteLine('A'); rn rn public virtual void Fun() rn rn Console.WriteLine("A.Fun()"); rn rn rnpublic class B: A rn rn public B() rn rn Console.WriteLine('B'); rn rn public new void Fun() rn rn Console.WriteLine("B.Fun()"); rn rn public static void Main() rn rn A a = new B(); rn a.Fun(); rn rn rn这段程序A a = new B(); 怎么理解呢？rn执行顺序是：rn先执行基类a的构造涵数，在来执行子类的构造涵数

A *pA2 = new A(); 为什么是正确的?: [code=C/C++]rn#include rnrnclass Arnrnpublic:rn A()rn rn std::cout << "A's Constructor is called.\r\n";rn rn;rnrnint main()rnrn A *pA1 = new A; // 这个正确可以理解, 因为的new语法是: new TypeName;rn A *pA2 = new A(); // 这个为什么正确呢? rnrn delete pA1;rn delete pA2;rnrn return 0;rnrn[/code]rnrn请问： rn[color=#0000FF]A *pA1 = new A; // 这个正确可以理解, 因为的new语法是: new TypeName;[/color]rn[color=#FF0000]A *pA2 = new A(); // 这个为什么正确呢? [/color]

请问A b = new A();的问题？: A b = new A();rn中第一个A表示的是什么意思？第二个A表示的是什么意思？rnrn

A ref = new A()的执行顺序问题: 如题，A ref = new A() 这个语句的执行顺序是?rn1, 先在堆上申请一块内存，然后执行构造函数，最后让ref指向该对象。rnrn 还是rnrn2. 先在堆上申请一块内存，然后让ref指向该对象，最后执行构造函数。rn rn 还是rnrn3. 1跟2都有可能。

short[] a=new short a[4];: 如题，我要声明数组，里面仅仅有4个还未输入的数字。我声明的方法怎么出错了，应该如何声明呢？

new[] 和new()的区别?: *p = new char[100];rn*p = new char(100);rn这两句到底有什么区别呢？

new 与不new的区别: rn一段代码如下，为什么声明datatable变量的时候不用new? 而声明dataset、Sqlconnection等都需要用new呢？不是在.net中，申明引用类型的变量都要用new吗？（Datatable也是一个类啊，应该是属于引用类型变量的吧？）rn private void LoadAllNews()rn rn AdoSql ReadAllNews=new AdoSql();//将AdoSql类实例化，定义一个对象ReadAllNewsrn DataTable NewsTable = ReadAllNews.ReadAllNews();rnrn this.NewsGrid.DataSource=NewsTable;rnrn this.NewsGrid.DataBind();rn

operator new 和new的区别？: operator new 和new的区别？还有operator delete和delete的区别？

C++Ox: The Dawning of a New Standard: It's been 10 years since the first ISO C++ standard, and 2009 will bring us the second. In this special report, DevX delves into the new features being discussed by the standards team. Learn how these new features will revolutionize the way you code.

A NEW INTRODUCTION TO MODAL LOGIC: A NEW INTRODUCTION TO MODAL LOGIC Preface ix Part One: Basic Modal Propositional Logic 1 The Basic Notions 3 The language of PC C) Interpretation D) Further operators F) Interpretation of A , D and s G) Validity (8) Testing for validity: (i) the truth-table method A0) Testing for validity: (ii) the Reductio method A1) Some valid wff of PC A3) Basic modal notions A3) The language of propositional modal logic A6) Validity in propositional modal logic A7) Exercises — 1 B1) Notes B2) 2 The Systems K, T and D 23 Systems of modal logic B3) The system K B4) Proofs of theorems B6) L and M C3) Validity and soundness C6) The system T D1) A definition of validity for T D3) The system D D3) A note on derived rules D5) Consistency D6) Constant wff D7) Exercises — 2 D8) Notes D9) 3 The Systems S4, S5, B, Triv and Ver 51 Iterated modalities E1) The system S4 E3) Modalities in S4 E4) Validity for S4 E6) The system S5 E8) Modalities in S5 E9) Validity for S5 F0) The Brouwerian system F2) Validity for B F3) Some other systems F4) Collapsing into PC F4) Exercises — 3 F8) Notes G0) 4 Testing for validity 72 Semantic diagrams G3) Alternatives in a diagram (80) S4 diagrams (85) S5-diagrams (91) Exercises — 4 (92) Notes (93) 5 Conjunctive Normal Form 94 Equivalence transformations (94) Conjunctive normal form (96) Modal functions and modal degree (97) S5 reduction theorem (98) MCNF theorem A01) Testing formulae in MCNF A03) The completeness of S5 A05) A decision procedure for S5-validity A08) Triv and Ver again A08) Exercises — 5 A10) Notes A10) 6 Completeness 111 Maximal consistent sets of wff A13) Maximal consistent extensions A14) Consistent sets of wff in modal systems A16) Canonical models A17) The completeness of K, T, B, S4 and S5 A19) Triv and Ver again A21) Exercises — 6 A22) Notes A23) Part Two: Normal Modal Systems 7 Canonical Models 127 Temporal interpretations of modal logic A27) Ending time A31) Convergence A34) The frames of canonical models A36) A non-canonical system A39) Exercises — 7 A41) Notes A42) 8 Finite Models 145 The finite model property A45) Establishing the finite model property A45) The completeness of KW A50) Decidability A52) Systems without the finite model property A53) Exercises — 8 A56) Notes A56) 9 Incompleteness 159 Frames and models A59) An incomplete modal system A60) KH and KW A64) Completeness and the finite model property A65) General frames A66) What might we understand by incompleteness? A68) Exercises — 9 A69) Notes A70) 10 Frames and Systems 172 Frames for T, S4, B and S5 A72) Irreflexiveness A76) Compactness A77) S4.3.1 A79) First-order definability A81) Second-order logic A88) Exercises — 10 A89) Notes A90) 11 Strict Implication 193 Historical preamble A93) The 'paradoxes of implication' A94) Material and strict implication A95) The 'Lewis' systems A97) The system SI A98) Lemmon's basis for SI A99) The system S2 B00) The system S3 B00) Validity in S2 and S3 B01) Entailment B02) Exercises — 11 B05) Notes B06) 12 Glimpses Beyond 210 Axiomatic PC B10) Natural deduction B11) Multiply modal logics B17) The expressive power of multi-modal logics B19) Propositional symbols B20) Dynamic logic B20) Neighbourhood semantics B21) Intermediate logics B24) 'Syntactical' approaches to modality B25) Probabilistic semantics B27) Algebraic semantics B29) Exercises — 12 B29) Notes B30) Part Three: Modal Predicate Logic 13 The Lower Predicate Calculus 235 Primitive symbols and formation rules of non-modal LPC B35) Interpretation B37) The Principle of replacement B40) Axiomatization B41) Some theorems of LPC B42) Modal LPC B43) Semantics for modal LPC B43) Systems of modal predicate logic B44) Theorems of modal LPC B44) Validity and soundness B47) De re and de dicto B50) Exercises — 13 B54) Notes B55) 14 The Completeness of Modal LPC 256 Canonical models for Modal LPC B56) Completeness in modal LPC B62) Incompleteness B65) Other incompleteness results B70) The monadic modal LPC B71) Exercises — 14 B72) Notes B72) 15 Expanding Domains 274 Validity without the Barcan Formula B74) Undefined formulae B77) Canonical models without BF B80) Completeness B82) Incompleteness without the Barcan Formula B83) LPC + S4.4 (S4.9) B83) Exercises — 15 B87) Notes B87) 16 Modality and Existence 289 Changing domains B89) The existence predicate B92) Axiomatization of systems with an existence predicate B93) Completeness for existence predicates B96) Incompleteness C02) Expanding languages C02) Possibilist quantification revisited C03) Kripke-style systems C04) Completeness of Kripke-style systems C06) Exercises — 16 C09) Notes C10) 17 Identity and Descriptions 312 Identity in LPC C12) Soundness and completeness C14) Definite descriptions C18) Descriptions and scope C23) Individual constants and function symbols C27) Exercises — 17 C28) Notes C29) 18 Intensional Objects 330 Contingent identity C30) Contingent identity systems C34) Quantifying over all intensional objects C35) Intensional objects and descriptions C42) Intensional predicates C44) Exercises — 18 C47) Notes C48) 19 Further Issues 349 First-order modal theories C49) Multiple indexing C50) Counterpart theory C53) Counterparts or intensional objects? C57) Notes C58) Axioms, Rules and Systems 359 Axioms for normal systems C59) Some normal systems C61) Non- normal systems C63) Modal predicate logic C65) Table I: Normal Modal Systems C67) Table II: Non-normal Modal Systems C68) Solutions to Selected Exercises 369 Bibliography 384 Index 398

A new latch-free LIGBT on SOI.pdf: 这是一篇关于功率半导体器件的论文，这篇文论主要介绍了在功率器件LIGBT中如何避免闩锁效应的发生，这种技术具有很大的使用价值

Create a new extension point: NULL 博文链接：https://shaxianwei.iteye.com/blog/615384

A New Ecology - Systems Perspective: 1. Introduction:A New Ecology is Needed 1 1.1 Environmental management has changed 1 1.2 Ecology is changing 2 1.3 Book outline 3 2. Ecosystems have Openness (Thermodynamic) 7 2.1 Why must ecosystems be open? 7 2.2 An isolated system would die (maximum entropy) 8 2.3 Physical openness 13 2.4 The second law of thermodynamics interpreted for open systems 18 2.5 Dissipative structure 20 2.6 Quantification of openness and allometric principles 22 2.7 The cell 30 2.8 What about the environment? 31 2.9 Conclusion 32 3. Ecosystems have Ontic Openness 35 3.1 Introduction 35 3.2 Why is ontic openness so obscure? 36 3.3 Ontic openness and the physical world 39 3.4 Ontic openness and relative stability 49 3.5 The macroscopic openness: Connections to thermodynamics 50 3.6 Ontic openness and emergence 53 3.7 Ontic openness and hierarchies 55 3.8 Consequences of ontic openness: a tentative conclusion 56 4. Ecosystems have Directionality 59 4.1 Since the beginnings of ecology 59 4.2 The challenge from thermodynamics 60 4.3 Deconstructing directionality? 62 4.4 Agencies imparting directionality 63 4.5 Origins of evolutionary drive 66 4.6 Quantifying directionality in ecosystems 68 4.7 Demystifying Darwin 74 4.8 Directionality in evolution? 76 4.9 Summary 77 v Else_SP-Jorgensen_contents.qxd 4/5/2007 12:17 Page vi vi Contents 5. Ecosystems have Connectivity 79 5.1 Introduction 79 5.2 Ecosystems as networks 80 5.3 Food webs 82 5.4 Systems analysis 84 5.5 Ecosystem connectivity and ecological network analysis 86 5.6 Network environ analysis primer 86 5.7 Summary of the major insights cardinal hypotheses (CH) from network environ analysis 92 5.8 Conclusions 101 6. Ecosystems have Complex Dynamics (Growth and Development) 103 6.1 Variability in life conditions 103 6.2 Ecosystem development 105 6.3 Orientors and succession theories 112 6.4 The maximum power principle 115 6.5 Exergy, ascendency, gradients, and ecosystem development 120 6.6 Support for the presented hypotheses 125 6.7 Toward a consistent ecosystem theory 133 6.8 Exergy balances for the utilization of solar radiation 139 6.9 Summary and conclusions 141 7. Ecosystems have Complex Dynamics – Disturbance and Decay 143 7.1 The normality of disturbance 143 7.2 The risk of orientor optimization 151 7.3 The characteristics of disturbance 152 7.4 Adaptability as a key function of ecosystem dynamics 156 7.5 Adaptive cycles on multiple scales 160 7.6 A case study: Human disturbance and retrogressive dynamics 164 7.7 Summary and conclusions 166 8. Ecosystem Principles have Broad Explanatory Power in Ecology 167 8.1 Introduction 167 8.2 Do ecological principles encompass other proposed ecological theories?: Evolutionary theory 168 8.3 Do ecological principles encompass other proposed ecological theories?: Island biogeography 176 8.4 Do ecological principles encompass other proposed ecological theories?: Latitudinal gradients in biodiversity 180 8.5 Do ecological principles encompass other proposed ecological theories?: Optimal foraging theory 184 8.6 Do ecological principles encompass other proposed ecological theories?: Niche theory 187 Else_SP-Jorgensen_contents.qxd 4/5/2007 12:17 Page vii Contents vii 8.7 Do ecological principles encompass other proposed ecological theories?: Liebig’s law of the minimum 191 8.8 Do ecological principles encompass other proposed ecological theories?: The river continuum concept (RCC) 194 8.9 Do ecological principles encompass other proposed ecological theories?: Hysteresis in nature 196 8.10 Conclusions 198 9. Ecosystem Principles have Applications 199 9.1 Introduction 199 9.2 Entropy production as an indicator of ecosystem trophic state 200 9.3 The use of ecological network analysis (ENA) for the simulation of the interaction of the american black bear and its environment 206 9.4 Applications of network analysis and ascendency to South Florida ecosystems 210 9.5 The application of eco-exergy as ecological indicator for assessment of ecosystem health 218 9.6 Emergy as ecological indicator to assess ecosystem health 221 9.7 The eco-exergy to empower ratio and the efficiency of ecosystems 228 9.8 Application of eco-exergy and ascendency as ecological indicator to the Mondego Estuary (Portugal) 231 9.9 Conclusions 241 10. Conclusions and Final Remarks 243 10.1 Are basic ecological properties needed to explain our observations? 243 10.2 Previous attempts to present an ecosystem theory 243 10.3 Recapitulation of the ecosystem theory 245 10.4 Are there basic ecosystem principles? 246 10.5 Conclusion 248 References 251 Index 273

A New Era of Network Processing: A New Era of Network Processing

artificial intelligence a new synthesis: 尼尔森人工智能课本，短小精悍，适合人工智能入门学习

A New Cryogenic CMOS Readout: CMOS Readout A New Cryogenic CMOS Readout

A New Approach to Underdetermined Blind: 适合搞数据挖掘的人和稀疏表示的人使用

A new spectral domain technique: 专业FDTD文献，广义双曲坐标柱坐标系中的算法，具有很强的工程使用价值

A New Perspective On Computer Concepts: 很经典的一本书，关于计算机的展望。很难找到纸版的

A new approach for the registration of images: 关于图像配准的一篇文献，英文的

A New Detail-Preserving Regularization Scheme: 医学磁共振重构方法，一种有效重构出高质量图像的方法。

A Flexible New Technique for Camera: 最近做标定搜索了一些标定方面的文章,最经典的要数张的单板标定和TSAI的两步法了.

A new technique for fully autonomou.pdf: A new technique for fully autonomous and efficient 3D robotics hand_eye calibration

vector *vec=new vector(a);: char* a="sth";rn vector *vec=new vector(a); rnrn编译显示:rn“std::vector::vector(const std::allocator &)”: 不能将参数 1 从“char *”转换为“const std::allocator &”rn withrn [rn _Ty=char *rn ]rn 原因如下: 无法从“char *”转换为“const std::allocator”rn withrn [rn _Ty=char *rn ]rn 无构造函数可以接受源类型，或构造函数重载决策不明确rnrnrn请问是什么原因?rnrn另外求一本详细的也许是数据结构还是什么的书,rn主要我现在很多rn类似:rnchar* a="sth";rnvector *vec=new vector(a); rn这种出错却不知道什么原因,rn还有char级别的一些东西感学很混淆rnchar * a="hello";rncout <

为什么不能new char('a'): //第四章：第4题rnimport java.util.*;rnrnclass DefaultTestrn DefaultTest(Object[][] x)rn for ( int i = 0 ; i < x.length ; i++ )rn for ( int j = 0 ; j < x[i].length ; j++ )rn prn("x[" + i + "][" + j + "] = " + x[i][j]);rn rn rn rnrn static void prn(String s)rn System.out.println(s);rn rnrnrnclass Testrn public static void main(String args[])rn DefaultTest t3 = new DefaultTest(new Object[][]rn new Integer(20),new String("mmgg"),new Double(3.15),rn new Long(20),new String("ttss"),new char('a'), );rn rnrnrnrn为什么不能new char('a')

A New Electromechanical Energy-Conversion Laboratory: A New Electromechanical Energy-Conversion Laboratory D.C.WHITE

A New Theory for Scattering of Electromagnetic: A New Theory for Scattering of Electromagnetic,做散射的会有用

Blockchain Blueprint for a new economy: 区块链的应用

A new framework for managing IT-enabled: framework for managing IT-enabled

Blockchain: Blueprint for a New Economy: Melanie Swan著，英文原版，epub格式

a new approach to archival storage.pdf: a new approach to archival storage.pdf why-organizations-need-to-archive-emails.pdf

为什么aninal A =new dog();: 才开始学java，看到书中的例子：rnaninal A =new dog();rn为什么不是new aninal()?，那这样A到底是animal类还是dog类？如果dog没有extend animal的话。。rn

A New Metaheuristic Bat-Inspired Algorithm: Metaheuristic algorithms such as particle swarm optimization and simulated annealing are now becoming powerful methods for solving many tough optimization problems . The vast majority of heuristic and metaheuristic algorithms have been derived

A New Geochemical-Sequence Stratigraphic Modell: A New Geochemical-Sequence Stratigraphic Modell

develop of a new si sensor: 一种新的烈度计设计，日本的si烈度计开发设计，希望了解的同学自己下载看

A New Intensity-Hue-Saturation Fusion Approach: 一篇有关遥感图像融合新方法的论文，发表于2015nian。

IncepText: A New Inception-Text Module: IncepText: A New Inception-Text Module with Deformable PSROI Pooling for Multi-Oriented Scene Text Detection

A new time-delay estimation in multipath: This paper addresses a new approach to time-delay estimation based upon the Autocorrelation Estimator (AE). The primary aim of this paper is to estimate time-delays in a multipath environment in absence of prior knowledge of the channel. The Maximum Likelihood Estimator (MLE) and AE are two computational tools that are used to determine the parameters of a multipath channel. MLE requires some priori knowledge of the source signal and the channel; AE can be a blind estimator but it is more suitable for a simple propagation model (one extra path). Under the multipath assumption we prove that if the observation sequence is zero padded the performance of MLE exceeds that of AE, however, at the price of higher computational efforts. The General Autocorrelator Estimator (GAE), based on autocorrelation of the received signal, is introduced. The GAE is formulated as a blind estimator, and the pertinent Cramer-Rao Lower Bounds (CRLB) are derived. We also develop an algorithm to estimate the parameters of a multipath environment based on the new generalization. The performance of this algorithm is examined for different signal-noise scenarios. Our results show that the time-delays are estimated accurately based on the proposed algorithm.

A new chaotic attractor coined: This letter reports the finding of a new chaotic attractor in a simple three-dimensional autonomous system,which connects the Lorenz attractor and Chen’s attractor and represents the transition from one to the other.

易语言模块免费破解下载: 3个易语言模块免费的非常好用~~~~~~~~~~~~~~~~~~~~~~~~ 相关下载链接：[url=//download.csdn.net/download/ankun1314/2530991?utm_source=bbsseo]//download.csdn.net/download/ankun1314/2530991?utm_source=bbsseo[/url]

反删除软件下载: 可以恢复经过回收站后删除的文件，但需恢复的目标盘被再次写入则不一定能恢复。相关下载链接：[url=//download.csdn.net/download/zzf112233/4154050?utm_source=bbsseo]//download.csdn.net/download/zzf112233/4154050?utm_source=bbsseo[/url]

atto+disk+benchmarks下载: atto+disk+benchmarks+v2.41+优盘,数码存储卡的测速工具单文件绿色修正版相关下载链接：[url=//download.csdn.net/download/sgj413/4623897?utm_source=bbsseo]//download.csdn.net/download/sgj413/4623897?utm_source=bbsseo[/url]

相关热词 c# 标准差计算 c#siki第五季 c#入门推荐书 c# 解码海康数据流 c# xml的遍历循环 c# 取查看源码没有的 c#解决高并发委托 c#日期转化为字符串 c# 显示问号 c# 字典对象池

我们是很有底线的