Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Recursive method call in C# is called Recursion. Let us see an example to calculate power of a number using recursion.Here, if the power is not equal to 0, then the function call occurs which is eventually recursion −if (p!=0) { return (n * power(n, p - 1)); }Above, n is the number itself and the power reduces on every iteration as shown below −Exampleusing System; using System.IO; public class Demo { public static void Main(string[] args) { int n = 5; int p = 2; long res; ... Read More
Sealed class in C# with the sealed keyword cannot be inherited. In the same way, the sealed keyword can be added to the method.When you use sealed modifiers in C# on a method, then the method loses its capabilities of overriding. The sealed method should be part of a derived class and the method must be an overridden method.Let us see an example of sealed class in C# −Exampleusing System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Demo { class Program { static void Main(string[] args) { Result ob = new ... Read More
A static constructor is a constructor declared using a static modifier. It is the first block of code executed in a class. With that, a static constructor executes only once in the life cycle of class.The following is an example of static constructors in C# −Exampleusing System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Difference { class Demo { static int val1; int val2; static Demo() { Console.WriteLine("This is Static Constructor"); val1 = 70; } ... Read More
The C# static class cannot be instantiated and can only have only static members. The static class in C# is sealed and cannot contain instance constructors.The following is an example with static class and static members −Exampleusing System; public static class Demo { public static float PI = 3.14f; public static int calc(int n){return n*n;} } class Program { public static void Main(string[] args) { Console.WriteLine("PI: "+Demo.PI); Console.WriteLine("Square: " + Demo.calc(3)); } }Above, the static class is −public static class Demo { public static float PI ... Read More
Forward declarations means the declaration of a method or variable prior to its implementation. Such declaration is necessary in C/C++ programming language in order to be able to use a variable or object before its implementation. In case, if we want to use a library code, then we need to create its header file and use it. But this is not a case in Java.Java allows using a variable, class prior to its declaration and implementation.Java allows using libraries code without any need of header files.Following example showcases the same. Here we have used a class object before its declaration.Examplepublic ... Read More
Following are the notable differences between super() and this() methods in Java. super()this()Definitionsuper() - refers immediate parent class instance.this() - refers current class instance.InvokeCan be used to invoke immediate parent class method.Can be used to invoke current class method.Constructorsuper() acts as immediate parent class constructor and should be first line in child class constructor.this() acts as current class constructor and can be used in parametrized constructors.OverrideWhen invoking a superclass version of an overridden method the super keyword is used.When invoking a current version of an overridden method the this keyword is used.Example Live Democlass Animal { String name; Animal(String name) ... Read More
The Directory class in C# has many methods to perform operations on directories and sub-directories −Sr.NoMethod & Description1CreateDirectory(String)Creates all directories and subdirectories in the specified path unless they already exist.2CreateDirectoryDirectorySecurity(String)Creates all the directories in the specified path, unless the already exist, applying the specified Windows security.3Delete(String)Deletes an empty directory from a specified path.4DeleteBoolean(String)Deletes the specified directory and, if indicated, any subdirectories and files in the directory.5EnumerateDirectories(String)Returns an enumerable collection of directory names in a specified path.6EnumerateDirectories(String, String)Returns an enumerable collection of directory names that match a search pattern in a specified path.To get the directory names, use the EnumerateDirectories method. ... Read More
The System.Math class in C# provides methods are properties to perform mathematical operations, trigonometric, logarithmic calculations, etc.Some of its methods include −Sr.NoMethod & Description1Abs(Decimal)Returns the absolute value of a Decimal number.2Abs(Double)Returns the absolute value of a double-precision floating-point number.3Abs(Int16)Returns the absolute value of a 16-bit signed integer.4Abs(Int32)Returns the absolute value of a 32-bit signed integer.5Abs(Int64)Returns the absolute value of a 64-bit signed integer.6Abs(SByte)Returns the absolute value of an 8-bit signed integer.7Abs(Single)Returns the absolute value of a single-precision floating-point number.8Acos(Double)Returns the angle whose cosine is the specified number.9Asin(Double)Returns the angle whose sine is the specified number.10Atan(Double)Returns the angle whose tangent is ... Read More
The following are the logical operators that you can use on Strings in C#.OperatorDescriptionExample&&Called Logical AND operator. If both the operands are non zero then condition becomes true.(A && B) is false.||Called Logical OR Operator. If any of the two operands is non zero then condition becomes true.(A || B) is true.!Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.!(A && B) is true.Let us see an example showing how to use logical AND operator on strings −Example Live Demousing System; using System.Collections.Generic; using System.Linq; ... Read More
Following are the different ways to convert an Integer to String in Java.Using Integer.toString(int) − Convert an int to String using static toString() method of Integer class.String b = Integer.toString(125);Using String.valueOf(int) − Convert an int to String using static valueOf() method of String class.String b = String.valueOf(125);Using new Integer(int).toString() − Convert an int to String using toString() method of Integer object.String b = new Integer(125).toString();Using DecimalFormat(pattern).format(int) − Convert an int to String using DecimalFormat.format() method.String b = new DecimalFormat("#").format(125);Using StringBuilder().toString() − Convert an int to String using StringBuilder.toString() method.String b = new StringBuilder().append(125).toString();Using StringBuffer().toString() − Convert an int to String ... Read More