To display multiplication table, you need to set the numbers and format the output property. Let’s say you want to find the table of 4 from 1 to 10. For that, set a while loop first till 10.while (a

Set the stringstring s = "Tom Cruise";Now let’s say you need to find the substring “Tom”, then use the Contains() method.if (s.Contains("Tom") == true) {    Console.WriteLine("Substring found!"); }The following is the code to learn how to find a substring from a string −Example Live Demousing System; public class Demo {    public static void Main() {       string s = "Tom Cruise";       if (s.Contains("Tom") == true) {          Console.WriteLine("Substring found!");       } else {          Console.WriteLine("Substring not found!");       }    } }OutputSubstring found!

Firstly, set the string to be replaced.string str = "Demo text!";Now use the replace() method to replace the above string.string res = str.Replace("Demo ", "New ");The following is the complete code to replace a word in a string.Example Live Demousing System; public class Demo {    public static void Main() {       string str = "Demo text!";       Console.WriteLine(str);       string res = str.Replace("Demo ", "New ");       Console.WriteLine("After replacing...");       Console.WriteLine(res);    } }OutputDemo text! After replacing... New text!

To find a number in a string, use Regular Expressions.We have set the Regex pattern to get number from a string.Regex r = new Regex(@"\d+");Now, use Match class in C# to set the string.Match m = r.Match("Welcome! We are open 365 days in a year!");Use the Success property now to display the result if number is found in the string as shown in the following complete code −Example Live Demousing System; using System.Text.RegularExpressions; class Demo {    static void Main() {       Regex r = new Regex(@"\d+");       Match m = r.Match("Welcome! We are open ... Read More

Firstly, set the first two numbers −double val1, val2; val1 = 10; val2 = 5;Now use the Math.Sqrt function to use Pythagoras Theorem.res = Math.Sqrt(val1 * val1 + val2 * val2);Example Live Demousing System; public class Program {    public static void Main(string[] args) {       double val1, val2, res;       val1 = 10;       val2 = 5;       res = Math.Sqrt(val1 * val1 + val2 * val2);       Console.WriteLine("Result = {0}", res);       Console.ReadLine();    } }OutputResult = 11.1803398874989

Firstly, set a list with empty string as elements.List myList = new List() {    " ",    " ",    " " };Now let us remove one empty element using index.myList.RemoveAt(0);Example Live Demousing System; using System.Collections.Generic; using System.Linq; class Program {    static void Main() {       List myList = new List() {          " ",          " ",          " "       };       Console.Write("Initial list with empty strings...");       foreach (string list in myList) {         ... Read More

Firstly, set a a new ArrayList and add elements to it.ArrayList arr = new ArrayList(); arr.Add( "Jones" ); arr.Add( "Tom" ); arr.Add( "Henry" );Now let’s remove the item “Tom”. For that, use the Remove() method.arr.Remove("Tom");The following is the complete example to remove an element from ArrayList −Example Live Demousing System; using System.Collections; class Demo {    static void Main(){       ArrayList arr = new ArrayList();       arr.Add( "Jones" );       arr.Add( "Tom" );       arr.Add( "Henry" );       Console.WriteLine("Initial ArrayList...");       foreach(string str in arr) {   ... Read More

Declare a new ArrayList and add elements to it.ArrayList arr = new ArrayList(); arr.Add( "One" ); arr.Add( "Two" ); arr.Add( "Three" ); arr.Add( "Four" );Now let’s say you need to remove the element “Three”. For that, use the Remove() method.arr.Remove("Three");The following is the complete example to remove an element from ArrayList −Example Live Demousing System; using System.Collections; class Demo {    static void Main() {       ArrayList arr = new ArrayList();       arr.Add( "One" );       arr.Add( "Two" );       arr.Add( "Three" );       arr.Add( "Four" );   ... Read More

Firstly, declare and initialize one dimensional array.int[] arr = { 35, 12, 66, 90, 34, 2, 64 };Now, use the following to reverse −Array.Reverse(arr);The following is the complete code to reverse a one-dimensional array;Example Live Demousing System; class Demo {    static void Main() {       int[] arr = { 76, 12, 66, 90, 34, 2, 64 };       // Initial Array       Console.WriteLine("Original Array= ");       foreach (int i in arr) {          Console.WriteLine(i);       }       // Reverse Array       Array.Reverse(arr);       Console.WriteLine("Reversed Array= ");       foreach (int j in arr) {          Console.WriteLine(j);       }       Console.ReadLine();    } }OutputOriginal Array= 76 12 66 90 34 2 64 Reversed Array= 64 2 34 90 66 12 76

For displaying the first ten numbers, firstly set the first two numbers.int val1 = 0, val2 = 1;Now, use a for loop from 2 to 10, to display first ten Fibonacci numbers −for(i=2;i