Arrays in C# - Dr. M AOUDE ULFG March 15, 2024 Quiz

C# Arrays

• An array is a data structure that allows you to store a collection of elements of the same data type.
• To refer to a specific element in an array, you use its index, starting from 0 for the first element.
• You can create an array in C# using the following format: data_type[] array_name = new data_type[size]; where data_type is the type of elements to store, array_name is the name of the array, and size is the number of elements.
• Arrays in C# are considered as instances of the System.Array class.
• Arrays are typically created with the 'new' keyword to allocate memory for the array elements according to the specified size.

Iterating Arrays in C#

• The foreach statement is used to iterate over each element in a collection like an array without directly working with indices.
• The iteration variable used in a foreach loop has a limitation: it can only read the elements, not modify them.
• foreach statements should be used with arrays when you need to read all elements in an array sequentially without direct interaction with indices.

Keyword Usage

• The 'var' keyword indicates that the variable's type is inferred from the value assigned to it. This improves code readability.
• The foreach statement with arrays isn't suitable for tasks requiring modification of array elements while iterating.
• The params keyword allows a method to accept a variable number of arguments of a specific type.
• In C#, the params keyword should be placed before the parameter declaration in the method heading.

Advanced Array Concepts

• A parallel array is a group of arrays that are used together to store related data. For example, string[] names = new string[3] and int[] ages = new int[3] are parallel arrays as each array stores data about a corresponding person.
• Arrays are often used in classes in C# to store collections of data, like a class representing a student with fields for name, age, grades, which are all stored within arrays.

Code Snippet Analysis

• In the code snippet DisplayItems(1, 2, 3, 5);, assuming DisplayItems sums all provided integers, the total value would be 11.
• The ModifyElement(array) method likely attempts to modify one or more element in the provided array.

Test your knowledge on arrays in C# with this quiz. Questions cover topics such as iterating over arrays using foreach loop and calculating the total of array elements. Get ready to enhance your C# skills!