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1. Top results related to 3 degrees of abstraction in c#

   • C# Find every number divisible by 3, in a string of numbers

     Top Answer

     Answered Sep 17, 2021 · 3 votes

     This is still vulnerable to overflows, but it would take a very long string indeed to reach that point:

     class Program{ static void Main(string[] args) { Console.Write("Enter a string of numbers: "); string Nums = Console.ReadLine(); Console.WriteLine("The following numbers are divisble by 3: "); foreach(var result in DivisibleByThree(Nums)) { Console.WriteLine(result); } Console.ReadKey(true); } public static IEnumerable<string> DivisibleByThree(string input) { for (int i = 0; i < input.Length; i++) { for(int j = input.Length; j > i; j--) { string segment = input.Substring(i, j-i); if (SumOfDigits(segment) % 3 == 0) { yield return segment; } } } } public static int SumOfDigits(string digits) { return digits.Where(c => char.IsDigit(c)).Select(c => c-'0').Sum(); }}

     See it work here:

     https://dotnetfiddle.net/KacyAD

     And since someone suggested recursion, I thought that'd be fun to try. I didn't quite get as far as I wanted (removing both loops and using recursion as the only repetition mechanism), but this does work:

     public static IEnumerable<string> DivisibleByThree(string input){ if (input.Length > 1) { foreach(var item in DivisibleByThree(input.Substring(0, input.Length-1))) { yield return item; } } while(input.Length > 0) { if ( SumOfDigits(input) % 3 == 0) yield return input; input = input.Substring(1); }}

     But that's the boring recursion. From a pure performance standpoint, it still spends a lot of time summing the same sequences of digits. There's a probably a way to use recursion to preserve prior work on each recursive call, and in that way make this run significantly faster.

     That is, rather than start with a big string and check progressively smaller segments, start with the small string and with each check add the sum for the just the additional digit:

     public static IEnumerable<string> DivisibleByThree(string input){ for(int i = input.Length - 1; i>=0; i--) { foreach(var item in DivisibleByThreeR(input.Substring(i, input.Length - i), 0, 0, 0)) yield return item; }}public static IEnumerable<string> DivisibleByThreeR(string input, int startPos, int nextPos, int sum){ sum += input[nextPos] - '0'; if (sum % 3 == 0) yield return input.Substring(startPos, nextPos - startPos + 1); if (++nextPos < input.Length) { foreach (var item in DivisibleByThreeR(input, startPos, nextPos, sum)) yield return item; }}

     I'm not sure this is really any faster. I didn't benchmark or test at all beyond getting the right result. In fact, I suspect the iterators will eat up any improvements over the pure-loop version.

     There's also probably a way to move the loop in the outer method also into the recursive function thereby optimize even further. But it was a nice exercise.

     Here's my final fiddle if anyone else wants to play:

     https://dotnetfiddle.net/dGFWNx

     Check all answers on Stack Overflow

     1/5

   • C# equivalent of DllMain in C (WinAPI)

     Top Answer

     Answered Nov 21, 2011 · 18 votes

     Give your class a static constructor and do your initialization there. It will run the first time anybody calls a static method or property of your class or constructs an instance of your class.

     Check all answers on Stack Overflow

     2/5

   • 3 digit random number in C#

     Top Answer

     Answered Jan 22, 2013 · 22 votes

     Yes - your current code isn't random at all. It's based on the system time. In particular, if you use this from several threads at the same time - or even several times within the same thread in quick succession - you'll get the same number each time.

     You should be using Random

     or RandomNumberGenerator

     (which is more secure).

     For example, once you've got an instance of Random, you could use:

     int value = rng.Next(1000);string text = value.ToString("000");-

     (That's assuming you want the digits as text. If you want an integer which is guaranteed to be three digits, use rng.Next(100, 1000).)

     However, there are caveats around Random:

     • You don't want to create a new instance each time you use it; that would also be time based unless you specify a seed
     • It's not thread-safe

     So ideally you probably want one per thread. My article on randomness talks more about this and gives some sample code.

     Check all answers on Stack Overflow

     3/5

   • C# optional properties in C# 3.0 (2009)

     Top Answer

     Answered Nov 09, 2009 · 24 votes

     You can decorate these properties with attribute you define and mark the properties as optional.

     [AttributeUsage(AttributeTargets.Property, Inherited = false, AllowMultiple = false)]internal sealed class OptionalAttribute : Attribute{}public class Person{ public string Name { get; set; } [Optional] public string NickName { get; set; }}public class Verifier{ public bool IsInputOK(Person person) { foreach (var property in person.GetType().GetProperties()) { if (property.IsDefined(typeof(OptionalAttribute), true)) { continue; } if (string.IsNullOrEmpty((string)property.GetValue(person, null))) { return false; } } return true; }}

     You may also want to take a look at Validation Application Block which has similar capabilities out of the box.

     Check all answers on Stack Overflow

     4/5

   • c# comparing two lists of integers in c#

     Top Answer

     Answered Jul 24, 2017 · 3 votes

     bool isallnoHaveComments= !no_checks.Except(comment).Any();-

     Check all answers on Stack Overflow

     5/5

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2. dotnettutorials.net · lesson · abstraction-csharpAbstraction in C# with Examples - DOT NET Tutorials

   dotnettutorials.net · lesson · abstraction-csharp

   

   Abstraction in C# is one of the fundamental OOP principles which acts as a supporting principle. That means the Abstraction Principle in C# makes sure that all other three principles (Encapsulation, Polymorphism, and Inheritance) are working together to give the final shape of the project.

   • Encapsulation in C

     Abstraction in C#. 10 thoughts on “Encapsulation in C#”...

   • Inheritance in C

     Here, the terminology Parent Class and Child Class can also...

   • Abstract Methods and Abstract Classes

     Back to: C#.NET Tutorials For Beginners and Professionals...

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     The Concept of Abstraction and Encapsulation | OOP in C++ | C++ for Beginners

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4. Searches related to 3 degrees of abstraction in c#

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5. www.w3schools.com · cs · cs_abstractC# Abstraction - W3Schools

   www.w3schools.com · cs · cs_abstract

   

   Data abstraction is the process of hiding certain details and showing only essential information to the user. Abstraction can be achieved with either abstract classes or interfaces (which you will learn more about in the next chapter). The abstract keyword is used for classes and methods:

   Usage example

   abstract class Animal { public abstract void animalSound(); public void sleep() { Console.WriteLine("Zzz"); }}

   See more on w3schools

6. www.geeksforgeeks.org · c-sharp-abstractionC# | Abstraction - GeeksforGeeks

   www.geeksforgeeks.org · c-sharp-abstraction

   

   • Using Abstract Classes and Abstract Methods with An Example
   • Encapsulation vs Data Abstraction
   • Advantages of Abstraction

   There are situations in which we want to define a superclass that declares the structure of a given abstraction without providing a complete implementation of every method. That is, sometimes we want to create a superclass that only defines a generalized form that will be shared by all of its subclasses, leaving it to each subclass to fill in the d...

   See full list on geeksforgeeks.org

   Encapsulation is data hiding(information hiding) while Abstraction is detail hiding(implementation hiding).

   While encapsulation groups together data and methods that act upon the data, data abstraction deal with exposing to the user and hiding the details of implementation.

   See full list on geeksforgeeks.org

   It reduces the complexity of viewing things.

   Avoids code duplication and increases reusability.

   Helps to increase the security of an application or program as only important details are provided to the user.

   See full list on geeksforgeeks.org

7. dotnettutorials.net · lesson · real-time-examples-ofReal-Time Examples of Abstraction Principle in C#

   dotnettutorials.net · lesson · real-time-examples-of

   

   In this article, I will discuss Multiple Real-Time Examples of the Abstraction Principle in C#. It is one of the OOPs Principle.

8. lets-coding.com · csharp · abstractionC# Abstraction - lets-coding.com

   lets-coding.com · csharp · abstraction

   

   This tutorial covers the basics of abstraction, abstract classes, interfaces, and best practices for using abstraction in C#. 1. Understanding Abstraction. Abstraction focuses on hiding the complex implementation details of an object and exposing only the necessary features.

9. www.codeguru.com · csharp · c-sharp-abstractionIntroduction to Abstraction in C# - CodeGuru

   www.codeguru.com · csharp · c-sharp-abstraction

   

   Jan 6, 2023 · To make your C# code more maintainable and understandable, abstraction can be a powerful tool. By hiding the details of an implementation behind a well-defined interface, you can improve the readability of your code and make it simpler to change or extend the functionality of your program.

10. People also ask

    How to create an abstract class in C#?

    • In C# abstraction is achieved with the help of Abstract classes and Access modifiers Abstract Classes An abstract class is declared with the help of abstract keyword. In C#, you are not allowed to create objects of the abstract class. Or in other words, you cannot use the abstract class directly with the new operator.

    C# | Abstraction - GeeksforGeeks

    www.geeksforgeeks.org/c-sharp-abstraction/

    See all results for this question

    How abstract classes are used to achieve abstraction in C#?

    • The abstract classes are used to achieve abstraction in C#. Abstraction is one of the important concepts of object-oriented programming. It allows us to hide unnecessary details and only show the needed information. This helps us to manage complexity by hiding details with a simpler, higher-level idea.

    C# abstract class and method (With Examples) - Programiz

    www.programiz.com/csharp-programming/abstract-class

    See all results for this question

    Can we use Destructors inside abstract class in C#?

    • Note: We can also use destructors inside the abstract class. The abstract classes are used to achieve abstraction in C#. Abstraction is one of the important concepts of object-oriented programming. It allows us to hide unnecessary details and only show the needed information.

    C# abstract class and method (With Examples) - Programiz

    www.programiz.com/csharp-programming/abstract-class

    See all results for this question

    What is an abstract method in C#?

    • To know more, visit C# sealed class and method. A method that does not have a body is known as an abstract method. We use the abstract keyword to create abstract methods. For example, Here, display () is an abstract method. An abstract method can only be present inside an abstract class.

    C# abstract class and method (With Examples) - Programiz

    www.programiz.com/csharp-programming/abstract-class

    See all results for this question

11. www.programiz.com · csharp-programming · abstract-classC# abstract class and method (With Examples) - Programiz

    www.programiz.com · csharp-programming · abstract-class

    

    In C#, we cannot create objects of an abstract class. We use the abstract keyword to create an abstract class. In this tutorial, we will learn about C# abstract class and method with the help of examples.