Reprint please indicate the source: Wang 亟亟 's way of DanielBefore in the process of painting mentioned the static rotation ah, scaling ah, panning and some other effects. The view of your own definition, of course, also has a dynamic effect, which
One, have to mention the volatileVolatile is a very old keyword, almost with the birth of the JDK, we all know the keyword, but it is not clear when it will be used, we are ubiquitous in the JDK and open source framework, but the concurrency experts
Difference between typedef and define
The following code is used to describe
Typedef char * typedef_char;# Define define_char char * // No semicolon here
Void main (INT argc, char * argv []){Char s [] = "ASDF ";Const typedef_char P = s; // char *
What do we often do with define?
1) define a constant
2) define a macro
Why do not use define. The following two aspects are explained:
1) when we define a constant, we can use the following method:
# Define aspect_patio 1.653
We know
I only want to solve the speed problem. I don't mention the usage for the moment. someone on the Internet said that Const is a structure syntax and the speed will be several times higher than the define function. I need a professional saying, is
Tag:io use sp on file div bs code ad First, let's start with the beginning of the file, in a lot of header files, we will see this statement #ifndef _myheadfile_h #define _MYHEADFILE_H//.... Statement ...
As we all know, define defines constants. What if we define constants in a class? Of course, define cannot be used, but const can be used, for example: The code is as follows:Copy code Define ('php', 'I love php'); // constants are usually
First to fourth useUse one:Defines an alias for a type, not just a simple macro substitution. Can be used as multiple objects that declare a pointer type at the same time. For example: char* PA, PB; The majority does not conform to our intention, it
Table of Contents
Creating a MySQL foreign key
MySQL foreign key support in database engines
MySQL foreign keys and on UPDATE and on DELETE
MySQL foreign Key Faq:how do I define a foreign key in MySQL?Answer:here ' s A quick
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