Huy kaka, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class User
    {
        public float Number
        {
            set; get;
        }
    }

public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            var a = new float[] { 1, 2 };
            Total(a); // = 3 
            // sai ở đâu
        }
        
        public static void Calculator(float number, User u)
        {
            var a = u.Number + number;
            u.Number = a;
            // save user
            //...
        }
        
        public static void Total(float[] a)
        {
            var dics = new Dictionary<string, User>();
            foreach (var aa in a)
            {
                if (!dics.ContainsKey("u1")) dics["u1"] = new User();
                Calculator(aa, dics["u1"]);
                dics["u1"].Number = dics["u1"].Number + aa;
            }
            Console.WriteLine($"user 3: {dics["u1"].Number}");
        }
    }

}

Show compiler warnings [ + ] Show input
Compilation time: 0,22 sec, absolute running time: 0,09 sec, cpu time: 0,14 sec, average memory usage: 14 Mb, average nr of threads: 3, absolute service time: 0,39 sec