wcag 2 1 differences

Recently in learning Python, like many beginners, the beginning of a more tangled in the end is version 2 or version 3 is the future trend. In order to avoid too many detours, special online Check the relevant information, summed up some 2 and 3 differences, a lot of content is reproduced, the great God do not despise ha ...

Recently in learning Python, like many beginners, the beginning of a more tangled in the end is version 2 or version 3 is the future trend. In order to avoid too many detours, special online Check the relevant information, summed up some 2 and 3 differences, a lot of content is reproduced, the great God do not despise ha ...

ST_XXX ST;Another way to define this is to use a TypeDef, as shown below:typedef struct{int A;float B;}st_xxx;In this case, when you define an object, you can remove the previous struct, for example:St_xxx St;Of course the second way is still more troublesome, because the typedef must be used. Of course this is only in the C language, and in C + + There is no such problem. C + + is like a combination of the above two ways, for example:struct ST_XXX{int A;float B;};St_xxx St;4. Determination of

What are the differences between exit (0), exit (1), and exit (-1? When the process ends, the return value to the system is different. If your process is user, run echo $? You can see that the return value of your process is the value you set in the program, such as exit (0). Return 0 exit (0) to indicate that the program is normal, exit (

: integer data (all numbers) from -2^31 (-2,147,483,648) to 2^31–1 (2,147,483,647). The range represented by tinyint is a number between 0-255.3.tinyint (1), and tinyint (3) No difference, save 123 can be saved, and if tinyint (3) Zerofill, insert value 12, will be stored 012,zerofill auto left 0, this is the limit dis

1. $watch Simple to use$watch is a scope function that listens for model changes and notifies you when the part of your model changes.$watch (watchexpression, Listener, objectequality);The description of each parameter is as follows: Watchexpression: The Listener object, which can be a angular expression such as ' name ', or function such as functions () {return $scope. Name}. Listener: The function or expression that will be called when

Tags: description command gadget should--standard standard output dev fileThis article was reprinted from: 11595985By default, there are always three files open, standard input (keyboard input), standard output (output to screen), standard error (also output to screen), and their respective file descriptors are 0,1,2. So let's take a look at the differences between the following redirection methods:>/dev/null 2