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Our string is − string str = " My make "; Use the following regular expression to find the substring “make” @"\bmake\b" Here is the complete code − Example Live Demo using System; using System.Text.RegularExpressions; namespace RegExApplication { public class Program { private static void showMatch(string text, string expr) { Console.WriteLine("The Expression: " + expr); MatchCollection mc = Regex.Matches(text, expr); ... Read More
The most common databases used in C# are Microsoft SQL Server and Oracle. The following is done to work with databases. Connect Set the Database Name, Optional Parameters and Credentials. The username and password is needed to set a connection to the database. The connection string would look somewhat like this. private static string _connectionString = "Data Source=.;Integrated Security=SSPI;Initial Catalog=test;Application Name=Demo;Connection Timeout2w00"; Above, the Application Name is Demo. Select Statement To fetch data from the database, the SELECT statement is used Insert The INSERT command is used to insert data in the database. Update The database ... Read More
A Singleton pattern states that a class can have a single instance and multiple instances are not permitted to be created. For this purpose, we make the constructor of the class a private and return a instance via a static method. But using cloning, we can still create multiple instance of a class. See the example below − Example - Breaking Singleton Live Demo public class Tester{ public static void main(String[] args) throws CloneNotSupportedException { A a = A.getInstance(); ... Read More
Cohesion in C# shows the relationship within modules. It shows the functional strength of the modules. The greater the cohesion, the better will be the program design. It is the dependency between the modules internal elements like methods and internal modules. High cohesion will allow you to reuse classes and method. An example of High cohesion can be seen in System.Math class i.e.it has Mathematical constants and static methods − Math.Abs Math.PI Math.Pow A class that does a lot of things at a time is hard to understand and maintain. This is what we call low cohesion and ... Read More
Given the number, find length of the longest consecutive 1's in its binary representation. Example Input: n = 15 Output: 4 The binary representation of 14 is 1111. Algorithm Step 1: input the number. Step 2: use one counter variable c=0. Step 3: Count the number of iterations to reach i = 0. Step 4: This operation reduces length of every sequence of 1s by one. Example code # Python program to find # length of the longest # consecutive 1s in # binary representation of a number. def maxlength(n): # ... Read More
Here we use different python inbuilt function. First we use bin() for converting number into it’s binary for, then reverse the binary form of string and compare with originals, if match then palindrome otherwise not. Example Input: 5 Output: palindrome Explanation Binary representation of 5 is 101 Reverse it and result is 101, then compare and its match with originals. So its palindrome Algorithm Palindromenumber(n) /* n is the number */ Step 1: input n Step 2: convert n into binary form. Step 3: skip the first two characters of a string. Step 4: them reverse the ... Read More
To deal with classes effectively, use the concept of covariance and contra variance. Let us consider the following as our class. One is a base class for class Two, whereas Two is a base class for Three. class One { } class Two: One { } class Three : Two { } A base class can hold a derived class, but the opposite is not possible. With Covariance, you can pass a derived type where a base type is expected. Co-variance can be used on array, interface, delegates, etc in C#. Contra variance is for parameters. ... Read More
The .NET Framework 4 brought the System.Collections.Concurrent namespace. This has several collection classes that are thread-safe and scalable. These collections are called concurrent collections because they can be accessed by multiple threads at a time. The following concurrent collection types use lightweight synchronization mechanisms: SpinLock, SpinWait, etc. These are new in .NET Framework 4. Let us see the concurrent collection in C# − Type Description BlockingCollection Bounding and blocking functionality for any type. ConcurrentDictionary Thread-safe implementation of a dictionary of key-value pairs. ConcurrentQueue Thread-safe implementation of a FIFO (first-in, first-out) queue. ConcurrentStack Thread-safe ... Read More
In this post we will try to print an array or matrix of numbers at console in same manner as we generally write on paper. For this the logic is to access each element of array one by one and make them print separated by a space and when row get to emd in matrix then we will also change the row Example Live Demo public class Print2DArray { public static void main(String[] args) { final int[][] matrix = { ... Read More
For compiling unsafe code, you have to specify the /unsafe command-line switch with command-line compiler. For example, to compile a program named one.cs containing unsafe code, from command line, give the command − csc /unsafe one.cs Under Visual Studio IDE, enable use of unsafe code in the project properties. The following are the steps − Open Project properties by double clicking the properties node in the Solution Explorer. Click on the “Build” tab. Select the option "Allow unsafe code".