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To find the last matching element, use the Array.LastIndexOf method. Returns -1 if the element isn’t present in the integer array.The following is the array −int[] val = { 97, 45, 76, 21, 89, 45 };Now, let’s say you need to search the last Index of element 45. For that, use Array.LastIndexOf() method −int res = Array.LastIndexOf(val, 45);The following is an example −Example Live Demousing System; using System.Text; public class Demo { public static void Main() { int[] val = { 97, 45, 76, 21, 89, 45 }; // last Index of element 45 int res = Array.LastIndexOf(val, 45); // Display the index Console.WriteLine("Index of element 45 is = "+res); } }OutputIndex of element 45 is = 5
With TrueForAll() method in arrays, you can check every element for a condition.Let us see an example −Example Live Demousing System; using System.Text; public class Demo { public static void Main() { int[] val = { 97, 45, 76, 21, 89, 45 }; // checking whether all the array element are more than one or not bool result = Array.TrueForAll(val, res => res > 1); Console.WriteLine(result); } }OutputTrueWith TrueForAll() method in arrays, you can check every element for a condition.Let us see an example −Example Live Demousing System; ... Read More
Firstly, set a list −List myList = new List(); myList.Add(45); myList.Add(77);Now, to clear the above list, use Clear() −myList.Clear();Here is the complete code −Example Live Demousing System; using System.Collections.Generic; public class Demo { public static void Main() { List myList = new List(); myList.Add(45); myList.Add(77); Console.WriteLine("Elements: "+myList.Count); myList.Clear(); Console.WriteLine("Elements after using clear: "+myList.Count); } }OutputElements: 2 Elements after using clear: 0
Set an array −int[] val = new int[5]; // integer elements val[0] = 15; val[1] = 25; val[2] = 40; val[3] = 58; val[4] = 70;Now set a list and add array in it −List myList = new List(val);The following is the code −Example Live Demousing System; using System.Collections.Generic; public class Demo { public static void Main() { int[] val = new int[5]; // integer elements val[0] = 15; val[1] = 25; val[2] = 40; val[3] = 58; val[4] = 70; List myList = new List(val); Console.WriteLine("Elements..."); foreach(int res in myList) { Console.WriteLine(res); } // count integer elements Console.WriteLine("Number of elements: "+myList.Count); } }OutputElements... 15 25 40 58 70 Number of elements: 5
To illustrate this we are fetching all the records from a table named ‘Tutorials_tbl’ with the help of PHP script that uses mysql_fetch_assoc() function in the following example −Example
Gets the string representation of an Enum value using the Enum.GetName.It has two parameters −Type − Enumeration typeObject − Value of an enumerationThe following is an example −Example Live Demousing System; class Demo { enum Vehicle { Car, Motorbike, Truck, Bicycles }; static void Main() { // Usig GetName to get the string representation of enum type string res = Enum.GetName(typeof(Vehicle), Vehicle.Motorbike); // Displaying Console.WriteLine(res); } }OutputMotorbike
It gets an array of the names of constants in an enumeration. The following is the syntax −Enum.GetNames(Type)Here, Type is an enumeration type.The following is an example −Example Live Demousing System; class Demo { enum Vehicle { Car, Motorbike, Truck, }; static void Main() { // display the enum foreach ( string res in Enum.GetNames ( typeof (Vehicle))) Console.WriteLine (res); } }OutputCar Motorbike Truck
NullReferenceException occurs when you try to to access member fields, or function types that points to null.Here is an example −Example Live Demousing System; class Demo { static void Main() { string str = null; if (str.Length > 0) { Console.WriteLine(str); } } }OutputThe following is the output. It throws NullReferenceException, since you are tryonhg access a memebt that points to null −Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object at Demo.Main () [0x00002] in :0 [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object at Demo.Main () [0x00002] in :0
Firstly, declare and initialize two arrays −int[] arr1 = { 37, 45, 65 }; int[] arr2 = { 70, 89, 118 };Now create a new list −var myList = new List(); myList.AddRange(arr1); myList.AddRange(arr2);Use the AddRange() method the arrays into the newly created list.myList.AddRange(arr1); myList.AddRange(arr2);Now convert the list into array as shown below −Example Live Demousing System; using System.Collections.Generic; class Demo { static void Main() { int[] arr1 = { 37, 45, 65 }; int[] arr2 = { 70, 89, 118 }; // displaying array1 Console.WriteLine("Array 1..."); ... Read More
PHP uses following functions to fetch data from an existing MySQL table −mysql_query() functionThis function is used in PHP script to fetch data from an existing MySQL table. This function takes two parameters and returns TRUE on success or FALSE on failure. Its syntax is as follows −Syntaxbool mysql_query( sql, connection );Followings are the parameters used in this function −S. No.Parameter & Description1.SqlRequired - SQL query to fetch data from an existing MySQL table2.connectionOptional - if not specified, then the last opened connection by mysql_connect will be used.mysql_fetch_array() functionThis is another function which is used in PHP script while fetching ... Read More