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A proof of the definition of the vector dot product was written in front of it, because the proof is relatively simple, so it does not cause deep thinking. Later, when I was going to write a proof of cross-product, I found something really difficult to understand.Set two vectors $\mathbf{a} = (x_1, y_1, z_1), \mathbf{b} = (X_2, y_2, Z_2) $, the two vectors have an angle of $\theta$, and many textbooks include Wikipedia (crossProduct) The definitions g

Welcome to the second part of the "PHP Source for PHP developers" series. In the previous article, Ircmaxell explained where you can find the source code for PHP, its basic directory structure, and simply introduces some C languages (because PHP is written in C). If you miss the article, maybe you should read it before you start reading this article. In this article, we are talking about defining the internal functions of PHP and how they are understood. How to find the

BOS Project Note DayToday's content arrangement:1, process variables (set, get)2. Group tasks (candidates, candidate groups)3, exclusive gateway use4,spring integration Activiti5. Apply Activiti to the Bos Project6. implement process definition management (deploy, query, view png, delete) in BOS Project1. Process Variables 1.1 How to set process variables L Mode one: set when the process instance is startedL Way Two: Set up when handling tasksL Way

Http://blog.163.com/wshyao@126/blog/static/1070451420081018103237836/ # Connector and # Connector # The Concatenation symbol is composed of two pound signs. Its function is to connect two substrings (tokens) in the macro definition with parameters to form a new substring. But it cannot be the first or last substring. The so-called token refers to the minimum syntax unit that the compiler can recognize. The specific

Objective:In the work, many small partners will be in the PCH file definition some common macros, but also afraid to write these simple macro waste of time, and sometimes forget how to define what to do? I am also in the work of the same. So here to share some common macro definitions, like the small partners can be used directly in the project (continuous update)!For the convenience of everyone, please click on GitHub-Macro

0. PrefaceFrom the beginning of learning C language began to contact Makefile, consulted a lot of makefile information but the total feeling did not really master makefile. Assuming that you write a makefile, you always think it's very exhausting.So deliberately using the blog to summarize the relevant knowledge of makefile. The detailed use of the makefile is illustrated by the sample example.Examples say that makefile is divided into the following sections. For a lot of other content please re

Error message: Error C2065: ' Salary ': undeclared identifier#include Problem root: Compiler issues--c89 and C99C89 specifies that all local variables are declared at the beginning of the block before any execution of the statement.There is no restriction in C99 and C + + that variables can be declared anywhere in the block before first use.The variable declaration is placed in front of the error.#include Pros and cons of different stylesvariables are defined at the beginning of the function: ea

When using the GCC compiler, the program was able to compile, but the result was problematic, I looked up a lot of places, or I didn't know where the problem was. It was later discovered that a variable was not initialized. I felt that when using VS, I rarely delay time on this issue, so I think of the-wall parameters that are rarely used, and I compile it with the correct compiler and use the correct program, but a bunch of warnings and errors come out of the-wall. As follows: test2:in function

The relationship between the structure definition of data dataset and the instance Www.yescnet.com CNET Chinese web In. NET database development, it is unavoidable to use Datasets (datasets), when reading the MSDN Learning DataSet, because there is no clear distinction between the definition and the instance of the dataset, in the operation, there is always a dataset, where a dataset, around, but do not kn

Teaching Purpose: grasping the concept and type definition of linear table Teaching emphases: the type definition of linear table Teaching Difficulty: The type definition of linear table Teaching Content: Review: Types of data structures The characteristics of linear structure: In a non-empty finite set of data elements, (1) The existence of a uniq

Recently on several groups, it is often seen that a function in a class is asked how to invoke this. The method that is exposed after the definition. An essay on the realization of a class is now issued.First of all, the class, in a class we will have the following several characteristics:1. Public methods2. Private methods3. Properties4. Private variables5. DestructorsLet's look directly at an example:/*** defines class ***/var classes = function ()

C-function, c Function Definition 1. C's design principle is to use functions as the component module of the program. 2. A function is a self-contained unit of program code that completes a specific task. A function generally has two functions to execute some actions. A value is returned for the calling program. 3. The advantages of using functions, code reuse, and more modular programs. 4. Generally, the function is regarded as a black box, which pro