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Articles by Samual Sam
Page 52 of 151
String Literal Vs String Object in C#
String LiteralsString literals or constants are enclosed in double quotes "" or with @"". A string contains characters that are similar to character literals: plain characters, escape sequences, and universal characters.Here are some examples of String Literals −Hello, World" "Welcome, \The following is an example showing the usage of string literals −Exampleusing System; namespace Demo { class Program { static void Main(string[] args) { // string string str1 ="Hello, World"; Console.WriteLine(str1); // Multi-line string ...
Read MoreOverriding Vs Shadowing in C#
OverridingUnder overriding, you can define a behavior that's specific to the subclass type, which means a subclass can implement a parent class method based on its requirement.Let us see an example of abstract classes that implements Overriding −Exampleusing System; namespace PolymorphismApplication { abstract class Shape { public abstract int area(); } class Rectangle: Shape { private int length; private int width; public Rectangle( int a = 0, int b = 0) { length = a; ...
Read MoreSwap two Strings without using temp variable in C#
To swap two strings without using a temp variable, you can try the following code and logic.Append the second string with the first.str1 = str1 + str2;Set the str1 in str2.str2 = str1.Substring(0, str1.Length - str2.Length);Now, the final step is to set str2 in str1 −str1 = str1.Substring(str2.Length);Exampleusing System; class Demo { public static void Main(String[] args) { String str1 = "Brad"; String str2 = "Pitt"; Console.WriteLine("Strings before swap"); Console.WriteLine(str1); Console.WriteLine(str2); str1 = str1 + str2; ...
Read MoreHow to reverse a String using C#?
To reverse a string, use the Array.Reverse() method.Set the string you want to reverse −string str = "Amit";In the above method, we have converted the string into character array −char[] ch = str.ToCharArray();Then the Reverse() method is used.Array.Reverse(ch);Exampleusing System; namespace Demo { class Program { static void Main(string[] args) { string str = "Amit"; char[] ch = str.ToCharArray(); Array.Reverse(ch); foreach(var items in ch) { Console.WriteLine(items); } Console.ReadLine(); } } }
Read MorePrint Single and Multiple variable in C#
To display single variable value in C#, you just need to use Console.WriteLine()Let us see an example. Here, we have displayed the value of a single variable “a” in a line −Exampleusing System; using System.Linq; class Program { static void Main() { int a = 10; Console.WriteLine("Value: "+a); } }To display multiple variables value in C#, you need to use the comma operator in Console.WriteLine().Let us see an example. Here, we have displayed the value of multiple variables “a” and “b” in a line −Exampleusing System; using System.Linq; class Program ...
Read MorePrivate Constructors and Singleton Classes in C#
A private constructor is used in classes containing only static member as shown below −class Demo { // private constructor private Demo() { } public static a = 10; }A singleton class has normal methods and you can call it using an instance.To prevent multiple instances of the class, the private constructor is used.Let us see an example −Examplepublic class Singleton { static Singleton a = null; private Singleton() { } }
Read MoreStreams and Byte Streams in C#
A file is a collection of data stored in a disk with a specific name and a directory path. When a file is opened for reading or writing, it becomes a stream.The type of streams includes −Byte Streams − It includes Stream, FileStream, MemoryStream and BufferedStream.Character Streams − It includes Textreader-TextWriter, StreamReader, StraemWriter and other streams.Byte streams have classes that consider data in the stream as byte.Stream class is the base for other byte stream classes. The following are the properties −CanRead − Whether stream supports readingCanWrite − Whether stream supports writingLength − Length of the streamThe System.IO namespace has ...
Read MoreString format for DateTime in C#
Format DateTime using String.Format method.Let us see an example −Exampleusing System; static class Demo { static void Main() { DateTime d = new DateTime(2018, 2, 8, 12, 7, 7, 123); Console.WriteLine(String.Format("{0:y yy yyy yyyy}", d)); Console.WriteLine(String.Format("{0:M MM MMM MMMM}", d)); Console.WriteLine(String.Format("{0:d dd ddd dddd}", d)); } }Above we have first set the DateTime class object −DateTime d = new DateTime(2018, 2, 8, 12, 7, 7, 123);To format, we have used the String.Format() method and displayed date in different formats.String.Format("{0:y yy yyy yyyy}", d) String.Format("{0:M MM MMM MMMM}", d) String.Format("{0:d dd ddd dddd}", d
Read MoreWhy does the indexing start with zero in C# arrays?
Arrays were a pointer to an address in memory of the index. This index was the 1st element of the array. Here, the index is like an offset and the concept even before C language originated.Let’s say your array elements begins from 0Xff000 and has 5 elements like {35, 23, 67, 88, 90}. Therefore, you array in memory would be like the following because int is stored using 4 bytes.0Xff000 has 35 0Xff004 has 23 0Xff008 has 67 0Xff012 has 88 0Xff016 has 90That would mean when the array is accessed, zero offsets would be index 0.Let us further see ...
Read MoreFinal local variables in C#
To set final for a local variable, use the read-only keyword in C#, since the implementation of the final keyword is not possible.The readonly would allow the variables to be assigned a value only once. A field marked "read-only", can only be set once during the construction of an object. It cannot be changed.Let us see an example. Below, we have set the empCount field as read-only, which once assigned cannot be changed.Exampleclass Department { readonly int empCount; Employee(int empCount) { this. empCount = empCount; } void ChangeCount() { //empCount = 150; // Compile error } }
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