C# / .NET - calculate average of array

In this article, we would like to show you how to calculate average of array in C#.

Quick solution:

int[] numbers = { 1, 2, 3, 4 };

double average = numbers.Average();

Console.WriteLine(average); // Output: 2.5

or:

int[] numbers = { 1, 2, 3, 4 };

int sum = 0;

if (numbers.Any())
    foreach (int number in numbers)
        sum += number;

double average = (double)sum / numbers.Length;

Console.WriteLine(average); // Output: 2.5

1. Practical example using Linq

In this example, we use Average() method from System.Linq to caluclate average of the array.

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        int[] numbers = { 1, 2, 3, 4 };

        double average = numbers.Average();

        Console.WriteLine(average); // Output: 2.5
    }
}

Output:

2.5

2. Using foreach

In this example, we use foreach to sum all numbers in the List, then we divide the sum by the number of elements.

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        int[] numbers = { 1, 2, 3, 4 };

        Console.WriteLine(average(numbers)); // Output: 2.5
    }

    private static double average(int[] array)
    {
        int sum = 0;

        if (array.Any())
            foreach (int number in array)
                sum += number;

        return (double)sum / array.Length;
    }
}

Output:

2.5

References

1. Enumerable.Average Method (System.Linq) | Microsoft Docs
2. Enumerable.Any Method (System.Linq) | Microsoft Docs
3. List<T>.Count Property (System.Collections.Generic) | Microsoft Docs