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How to find all unique quadruples close to zero using C#?

The simplest way is that we can create four nested loops and check one by one whether the sum of all four elements is zero. If the sum of the four elements is zero, print the elements. Time complexity-O(n4)

Sep 22, 2023 pm 03:37 PM

Optional properties in C# classes

An attribute is optional if it is possible and valid to be null. Properties of CLR types that are not null cannot be configured as optional. An example usage of optional attributes: Example [AttributeUsage(AttributeTargets.Property,Inherited=false,AllowMultiple=false)]internalsealedclassOptionalAttribute:Attribute{}publicclassEmployee{ publicstringEmpName

Sep 22, 2023 am 10:13 AM

Null pointer exception in C#

NullReferenceExceptionisaC#versionofNullPointerException.TohandleandcatchitinC#,usetry-catch.Thebelowexampleshowsthatavariableissettonullandwhenwetrytoprintit,itthrowsanexceptionthatgetscaughtinthecatch−Try{ a=null;&n

Sep 21, 2023 pm 11:57 PM

How to get the name of the current executable file in C#?

There are several ways to get the name of the current executable file in C#. Using System.AppDomain - Application domains provide isolation between code running in different application domains. area. An application domain is a logical container of code and data, just like a process and has independent memory space and resource access. Application domains also act as process-like boundaries to avoid any accidental or illegal attempts to access the data of an object in one running application from another application. System.AppDomain class provides us with methods to handle application domains. Provides methods to create new application domains, unload domains from memory, etc. This method returns the file name with extension (eg: Appl

Sep 21, 2023 pm 11:01 PM

In C#, retrieve data value as pointer

A pointer is a variable whose value is the address of another variable. Use the ToString() method to retrieve the data stored at the location referenced by the pointer variable. Example Here is an example - usingSystem;namespaceUnsafeCodeApplication{ classProgram{ publicstaticvoidMain(){ unsafe{&a

Sep 21, 2023 pm 09:49 PM

Why do we use params keyword in C#?

When declaring a method, if you are not sure about the number of parameters to be passed as parameters, you can use C#'s param array. Here is a complete example for learning how to implement param in C#: Example usingSystem;namespaceProgram{ classParamArray{ publicintAddElements(paramsint[]arr){ &am

Sep 21, 2023 pm 05:53 PM

Deadlock and starvation in C#

A deadlock occurs when a resource is locked by one thread and another thread requires the resource at the same time. This problem occurs frequently in multiprocessing systems. This problem can occur when two or more threads are waiting for a resource that belongs to another thread. Here is an example - thread one thread two acquires lock P acquires lock Q requests lock Q requests lock P Thread one will not acquire lock Q as it belongs to thread two. Likewise, thread two will not acquire lock P because its original owner was thread one. A deadlock can also be a three-way deadlock, which occurs if three threads and three locks are common. Likewise, four-way, five-way, and other deadlocks can occur. Starvation is the permanent blocking of one or more runnable threads in a multi-threaded application.

Sep 21, 2023 pm 04:33 PM

DirectoryNotFoundException in C#

DirectoryNotFoundException occurs if the directory you are looking for does not exist. Here we try to find a non-existent directory using the GetDirectories() method. Example usingSystem.IO;usingSystem;classProgram{ staticvoidMain(){ Directory.GetDirectories("D:\ew\"); &am

Sep 21, 2023 pm 04:21 PM

How to write a pattern recognition algorithm using C#

How to write a pattern recognition algorithm using C# Introduction: Pattern recognition algorithm is a technology often used in the fields of computer science and artificial intelligence. It has wide applications in various fields, including image recognition, speech recognition, natural language processing, etc. This article will introduce how to use C# to write a simple pattern recognition algorithm, and attach specific code examples. 1. Background knowledge Before we start writing pattern recognition algorithms, we need to understand some background knowledge. Pattern recognition Pattern recognition refers to analyzing and processing a series of input data.

Sep 21, 2023 pm 03:22 PM

算法设计模式识别C#编程

Thread synchronization in C#

Use synchronization to synchronize resource access in multi-threaded applications. Using mutexes to synchronize threads Mutexes can be used to synchronize threads across processes. Use it to prevent multiple threads from executing a piece of code at the same time. C#'s lock statement is used to ensure that a piece of code will not be interrupted by other threads while it is running. Acquires a mutex lock for the given object for the duration of the code block. The lock statement takes an object as a parameter. The parameter assigned to the "lock" should be an object based on a reference type - publicclassDemo{ privateSystem.ObjectmyLock=newSystem.Object(); &n

Sep 21, 2023 pm 03:17 PM

How to write Huffman coding algorithm using C#

How to write Huffman coding algorithm using C# Introduction: Huffman coding algorithm is a lossless algorithm used for data compression. During data transmission or storage, data is effectively compressed by using shorter codes for more frequent characters and longer codes for less frequent characters. This article will introduce how to use C# to write the Huffman coding algorithm and provide specific code examples. The basic principle of Huffman coding algorithm The core idea of Huffman coding algorithm is to construct a Huffman tree. First, by counting the frequency of character occurrences, the

Sep 21, 2023 pm 03:14 PM

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How to write insertion sort algorithm using C#

How to use C# to write an insertion sort algorithm. Insertion sort is a simple and intuitive sorting algorithm that is often used in actual development. It works by constructing an ordered sequence. For unsorted data, it scans from back to front in the sorted sequence, finds the corresponding position and inserts it. Below we will introduce in detail how to write the insertion sort algorithm using C# and provide specific code examples. First, we need to define an array for sorting. In this example, we use an integer array for sorting, and the number of array elements is set to n. in

Sep 21, 2023 pm 12:54 PM

C# | 插入排序 | 编写

How to write Bloom filter algorithm using C#

How to use C# to write a Bloom filter algorithm. The Bloom Filter (BloomFilter) is a very space-efficient data structure that can be used to determine whether an element belongs to a set. Its basic idea is to map elements into a bit array through multiple independent hash functions and mark the bits of the corresponding bit array as 1. When judging whether an element belongs to the set, you only need to judge whether the bits of the corresponding bit array are all 1. If any bit is 0, it can be judged that the element is not in the set. Bloom filters feature fast queries and

Sep 21, 2023 am 10:24 AM

编写C#编程关键词: C#布隆过滤器算法

How to implement topological sorting algorithm in C#

How to implement the topological sorting algorithm in C# requires specific code examples. Topological sorting is a common graph algorithm used to solve the dependencies between nodes in a directed graph. In software development, topological sorting is often used to solve problems such as task scheduling and compilation order. This article will introduce how to implement the topological sorting algorithm in C# and provide specific code examples. Algorithm Principle The topological sorting algorithm establishes an adjacency list representation of a directed graph, and then uses depth-first search (DFS) or breadth-first search (BFS) to traverse the nodes in the graph and follow a certain

Sep 21, 2023 am 08:09 AM

C#: 拓扑排序算法