C# 算法简介

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 算法简介_05
{
    class Program
    {
        static void Main(string[] args)
        {
            Caculator c = new Caculator();

            //循环
            int SumXunHuan = c.SumFrom1ToX(100);
            Console.WriteLine(SumXunHuan);

            //递归
            int SumDiGui = c.SumFrom1ToXDiGui(3);
            Console.WriteLine(SumDiGui);

            //最简单算法
            int Sum3 = c.SumFrom1ToX3(100);
            Console.WriteLine(Sum3);
            Console.Read();
        }
    }
    class Caculator
    {
        public int SumFrom1ToX(int x)
        {
            int result = 0;

            for (int i = 1; i < x  + 1 ; i++)
            {
                result = result + i;
            }

            return result;
        }

        public int SumFrom1ToXDiGui(int x)
        {
            if (x == 1)
            {
                return 1;
            }
            else 
            {
                int result = x + SumFrom1ToXDiGui(x - 1);
                return result;
            }
        }

        public int SumFrom1ToX3(int x)
        {
            return (1 + x) * x / 2;
        }
    }
}

//循环初体验
//递归初体验
//计算 0 - 100 的和

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