Aggregation Demo C#/CSharp

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] array = { 1, 2, 3, 4, 5 };
        int result = array.Aggregate(AddNums);
        // 1 + 2 = 3
        // 3 + 3 = 6
        // 6 + 4 = 10
        // 10 + 5 = 15
        Console.WriteLine(result);

        result = array.Aggregate((a, b) => b * a);
        // 1 * 2 = 2
        // 2 * 3 = 6
        // 6 * 4 = 24
        // 24 * 5 = 120
        Console.WriteLine(result);
    }

    static int AddNums(int a, int b)
    {
        var result = a + b;
        Console.WriteLine($"a:{a} + b:{b} = {result}");
        return result;
    }
}