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$a=21;$b=$a++; $c=++$a; echo $a; echo $b; echo $c; I understand the results were 23, 22, 23, But why is the result of the input 23,21,23 solved? Reply content: $a=21;$b=$a++; $c=++$

Title: Give an array A, find a pair (I, J) make A[i] The most straightforward idea is that for each i from the end of the array start to find the first position of greater than or equal to A[i] j, Time complexity O (n^2).1. pairint,int> Find (Constvectorint> A)2. { 3.intn =

Basic concepts of three states:1. Temporary identity (Transient): Also known as Free State, it exists only in memory, and there is no corresponding data in the database.Object created with new, long, not in session, the object in this state is called a temporary object;2, Persistence State (persistent): associated with the session and has corresponding data in the database.Has persisted. Added to the session cache. objects, such as those saved through

I have never encountered this problem with CSS before. I recently gave it to an undergraduate project. Some problems occurred. Search Engines checked some websites and materials and found that many people asked this question. I tried the results and most of them were incorrect. The sequence of my tests may be helpful to you: A: link { Color: #000000; Text-Decoration: None } A: visited { Color: #000000; text

These terms may sound complicated, but they are not. It's just a simple truth. Believe me. First, let's look at the first case: return a reference to a local object. The problem is that the local object-as the name suggests-is only local. That is to say, a local object is created when it is defined and destroyed when i

A process is a running application in which each process has its own separate memory space. An application can start multiple processes at the same time. For example, for IE browser program, each open an IE browser window, start a new process. Similarly, each time the JDK's Java.exe program is executed, a separate Java

How can I convert a cad converter of a later version to a later version and save the converted files as a desktop? There are many versions of CAD conversion, but architectural designers sometimes use a relatively high version when editing CAD drawings. Sometimes they cannot

#include "stdafx.h"int a[] = {1,2,3,4,5,6,6,5,9,1,2};int b[] = {5,6};int LEN = sizeof (a)/sizeof (a[0]);void Yiwei (int* a,int b) {for (int i = B;i A[i] = a[i + 1];}}int main (){for (int i = 0;i printf ("%d\t",

Saturday with wife and children home, year near celebration mother Happy, must go to the streets to buy some good food to entertain us, how to persuade also not.Mother said: "You do not stop me, you come back, mom cooked a meal please you, not affected, is happy!" I said: "I will accompany you to go!" The mother said cheerfully, "good!" Good! You go, you say buy what, Mom buy what. ”Mother old age, legs appear very not flexible, walking how can not ge

These terms may sound complicated, but they are not. It's just a simple truth. Believe me. First, let's look at the first case: return a reference to a local object. The problem is that the local object ----- as the name suggests ----Only Local. That is to say, a local object is created when it is defined and destroyed

A member function is called as a thread function. A member function is called by a thread.Problems encountered In programming, We Need To encapsulate data into a class. Calling pthread_create to create a thread using the member fu

A programmer must have a tip for an interview. He understands the salary and needs a tip for a programmer interview. Recently, the company was relatively short of people and was interested in recruiting a group of developers and coders. I had the honor to participate in the

In three-dimensional space, a point around the x-axis y-axis z-axis rotation of a certain radian after the coordinates of the new point is easy to calculate, the problem is if it is the rotation axis is an arbitrary vector (x, y, z), how to know the rotation of angle radian after the new point coordinates it. In OpenGL there is a function Glrotatef (ANGLE,X,Y,Z)

A technical project manager can easily make the following mistake:When assigning tasks to members for self-thought-simple problems, technical details are introduced and the simplicity of the problems is revealed..For example, the project manager x needs to change a string on the page when receiving a new requirement from the customer. So I immediately called memb

I made a discount code function. how do I issue this discount code to members when they buy a product? I got a coupon code generation function in the mall background, how can I specify the discount code when adding a product? (note: There are multiple different discount codes with the same denomination). then, the memb

Free don't take a look at this blog: http://jonnyhsy.wordpress.com/category/algorithms-data-structure/ // Given an array a [n], build another array B [N], B [I] = A [0] * A [1] *… * A [n-1]/A [I]// No division can be used, O (n) t

First of all said Hub, that is, hubs. Its role can be simply understood to connect some machines to form a local area network. A switch (also known as a switched hub) works roughly the same as a hub. But there is a difference in performance: the way the hub uses shared bandw