Creating an Array

In this lesson, we will look at how to create arrays in C#, what methods are available, and what is important to consider when initializing them.

Creating an array with a specified size

When creating an array, you must specify the number of elements it contains. This number cannot be changed. Initially, the elements will be filled with default values.

Fig. 1: Create an array with default values


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int[] numbers = new int[3];
Console.WriteLine($"Array length: {numbers.Length}");
Console.WriteLine($"Element 1: {numbers[0]}");
Console.WriteLine($"Element 2: {numbers[1]}");
Console.WriteLine($"Element 3: {numbers[2]}");
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This array contains 3 numbers, initially all equal to 0.

Creating an array with initial values

You can fill an array with values immediately upon creation. The array size is set automatically.


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int[] numbers = new int[] { 10, 20, 30 };
Console.WriteLine($"Array length: {numbers.Length}");
Console.WriteLine($"Element 1: {numbers[0]}");
Console.WriteLine($"Element 2: {numbers[1]}");
Console.WriteLine($"Element 3: {numbers[2]}");
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Summary

In this lesson you learned:

how to create an array with a fixed size;
how to create an array with initial values;
that an array has a fixed length;

Exercises

Create an array of 5 integers without setting element values. Print the array length.


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// Your code
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Create an array of 4 strings with names: "Anna", "Boris", "Victor", "Galina". Print the array length.


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// Your code
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Try to create an array with 0 elements. Print the array length.


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// Your code
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