Many Linux beginners are confused by the following questions: * Why do I change settings and install software, but I am constantly asked to enter my password? * Why do some commands require `sudo` and some do not? * Why can’t I run programs downloaded from the Internet? Why can’t I see some directories in […]
Tag: hierarchy
C++ Polymorphism: (Screen manager using polymorphism of the Shape class hierarchy) Developing a basic graphics package.
Based on the previous articleC++ Polymorphism: Shape Class Hierarchyhttps://mp.csdn.net/mp_blog/creation/editor/133175074< /strong> 1. [Problem Description] Using C++ polymorphism: Shape class hierarchy implemented in Shape class hierarchy. Limited to 2D shapes such as squares, rectangles, triangles and circles. Interact with the user and let them specify the shape, position, and size; and the fill character used to draw […]
C++ inheritance: Package inheritance hierarchy
Create Package class [Problem Description] Some couriers, such as FedEx, DHL and UPS, offer a variety of services and charge different fees. Create an inheritance hierarchy that represents the various packages. Take Package class as base class, TwoDayPackage class and overnight package class OvernightPackage as derived classes. Base class Package should include data members representing […]
The magical hierarchy of SQL →Why can’t the columns in the original table be directly referenced after GROUP BY?
Restrictions on SELECT columns after GROUP BY Standard SQL stipulates that when performing an aggregate query on a table, only the following three types of content can be written in the SELECT clause: aggregate keys specified through the GROUP BY clause, aggregate functions (SUM, AVG, etc.), and constants. Let’s see an example We have the […]
The Sixth Level of Algorithmic Clearance Village – Classic Problems of Binary Tree Hierarchy Traversal (Silver)
Algorithm Clearance Village Sixth Level – Binary Tree Hierarchy Traversal Classic Problem (Silver) Basic level order traversal and exchange 1. Level order traversal of binary tree 2. Level order traversal of binary tree 2 3. Zigzag level order traversal of binary tree 4. Level order traversal of N-ary tree 4.1 Breadth-first algorithm 4.2 Depth-first algorithm […]
Organizing business script processes on the Hierarchy panel – using async and await
〇, concatenating multiple different scripts together and sequentially blocking execution Concatenate many scripts together, let them execute in order, wait for the execution of the previous ones to finish, and execute the latter ones. This is a process that can be executed sequentially by using [asynchronous method]. As shown in the figure below, process scripts […]
5.5 hierarchy interrupt controller driver
The legacy type interrupt controller is a one-to-one interrupt controller. When registering, it needs to specify its parent interrupt controller. The interrupt number of the parent interrupt controller and the interrupt number of the corresponding child interrupt controller share an irq_desc. Driver code writing The experimental program is a virtual interrupt controller driver, which uses […]
Use of Scala’s various collections (1) collection hierarchy and classification
1. There are several concepts that must be known when using scala collections 1. What is the predicate? A predicate is a method, a function or an anonymous function that accepts one or more functions and returns a Boolean value. For example: the following method returns true or false, so it is a predicate. scala> […]
The thread hierarchy of CUDA threads, and how a single thread threadIdx uses stride to perform skip operations and calculate multiple data at the same time
The concept of thread level: Simply put, a grid has multiple blocks, and a block has multiple threads. How big is the grid, and gridDim is used to indicate how many blocks it has, which are divided into gridDim.x, gridDim.y, and gridDim.z. How big is the block? Use blockDim to indicate how many threads it […]
Three.js – Seven, Group Hierarchy Model
About Group Group Hierarchy Model Create a group object group through the THREE.Group class, and then use the add method to set the mesh model mesh1 and mesh2 as the sub-objects of the group object group, and then use the group object group as the scene object by executing scene.add(group) Child objects of scene. That […]