sum 구하기

using System;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.SymbolStore;
using System.Runtime.CompilerServices;

namespace LearnDotnet
{
    internal class Program
    {
        
        static void Main(string[] args)
        {
            int sum = 0;
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine(i + 1);
                sum += (i + 1);
            }
            Console.WriteLine("----------");
            Console.WriteLine("sum: {0}", sum);
        }
    }
}