Indexing
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Every element of an array has an index which is simply its position in the array. The first element has the index 0, the second element has the index 1, and so on. Since indices start from 0, the last element's index is 1 less than the size of the array (size - 1).
The following illustration is a slightly modified version of the one from the last chapter however this time the elements have their corresponding indices written beneath them:
You can access an element of an array using the following syntax:
main.cs
1arrayName[index];
Consider the example of accessing the array element by it's index:
main.cs
12345678910111213using System; namespace ConsoleApp { internal class Program { static void Main(string[] args) { int[] studentMarks = new int[50]; Console.WriteLine(studentMarks[9]); // Output: 0 } } }
In the above code, we access the 10th element of the array and it outputs 0. This is because when you create a new empty array it is automatically filled with relevant zero values according to its data type.
Each element of an array is essentially a variable.
You can access and modify an element of an array using the following syntax:
main.cs
1arrayName[index] = newValue;
For example:
main.cs
1234567891011121314151617181920using System; namespace ConsoleApp { internal class Program { static void Main(string[] args) { int[] studentMarks = new int[50]; studentMarks[0] = 50; studentMarks[1] = 77; studentMarks[2] = 97; Console.WriteLine(studentMarks[0]); Console.WriteLine(studentMarks[1]); Console.WriteLine(studentMarks[2]); } } }
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