Chapter 7.9, Problem 7.23CP

Program Plan Intro

List:

• • The list is a class in C# which is similar to an array. But it is automatically adjust the size of the List object to store the items.
• • It is possible to delete the items in list like adding items.
• • An object of List automatically shrinks when items are deleted from it.
• • It helps to store and retrieve the items.
• • The format to declare a list is given below:

List<dataType> nameList= new List <dataType>();

• • Where,
  • ○ “List” indicates the class.
  • ○ “nameList” indicates an object of List class.
  • ○ “dataType” indicates the type of data such “int”, “double”, “string”, and so on.

List initialization:

It is optional to initialize an object of List. Consider the following example,

List<int> numList= new List <int>(){1, 2, 3, 4, 5};

Explanation:

Here, the statement creates an object of List with the name of “numList” which hold the integer values “1, 2, 3, 4, 5”.

Adding the items into List:

The items are added to an existing List by using the Add() method.

The format to add the items to list is given below:

  nameList.Add(items);

• • Where,
  • ○ “Add” is keyword to add the items into List.
  • ○ “nameList” indicates an object of List class.
  • ○ “items” indicates the value to add into list and it can be in any data type such as “int”, “double”, “string”, and so on.