OUT函数及其熟练使用，split的用法

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

namespace OUT函数
{
    class Program
    {
        //public void outzhi(double a, double b, double c, out double j1, out double j2)
        public void outzhi(double a, double b, double c, out string  j1, out string  j2)
        {
            double de = b * b - 4 * a * c;
            if (de < 0)
            {
                Console.WriteLine("函数没有实根");
                j1 = j2 = "";

            }
            else
            {
                double x1 = (-b + Math.Sqrt(de)) / (2 * a);
                double x2 = (-b - Math.Sqrt(de)) / (2 * a);
                if (de == 0)
                {
                    Console.WriteLine("方程有两个相同的实根");
                    j1 = j2 = x1.ToString();
                }
                else
                {
                    Console.WriteLine("方程有两个不同的实根");
                    //Console.Write("x1=" + x1); Console.Write("  x2=" + x2);
                    j1 = x1.ToString();
                    j2 = x2.ToString();
                }
            }

        }

        static void Main(string[] args)
        {
            Program hanshu = new Program();
            Console.Write("请输入a=");
            double a = double.Parse(Console.ReadLine());
            Console.Write("请输入b=");
            double b = double.Parse(Console.ReadLine());
            Console.Write("请输入c=");
            double c = double.Parse(Console.ReadLine());
            //double j1 = 0;
            //double j2 = 0;
            string j1 = "";
            string j2 = "";
            hanshu.outzhi(a, b, c, out j1, out j2);
            Console.WriteLine("第一个根x1=" + j1);
            Console.Write("第二个根x2=" + j2);
            Console.ReadLine();

        }
    }
}

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

namespace _0630下午
{
    class Program
    {
        public void  hou()
        {
            int sum = 0;
            for (int i = 10; i > 0; i--)
            {
                if (i == 10)
                {
                    sum = 1;
                }
                else
                {
                    sum = (sum + 1) * 2;
                }
            }
            Console.Write(sum);
        }

        public int jiafen(int  a)
        {
            a+= 10;
            return a;
        }

        public void jiafen2(int[] a)
        {
            int l= a.Length;
            for (int i = 0; i < l; i++)
            {
                a[i] += 10;
            }
        }

        public int [] jiafen4(int[] a)
        {
            int l = a.Length;
            for (int i = 0; i < l; i++)
            {
                a[i] += 10;
            }
            return a;
        }

        public void  jiafen3(int[] a, out int[] b)
        {
            int l = a.Length;
            for (int i = 0; i < l; i++)
            {
                a  [i] = a[i] + 10;
            }
            b = a;
        }

        static void Main(string[] args)
        {
            //out 传值    形式参数：只给值，不给变量名（传值）    实际参数：将变量名传给函数（传址）
            //out是实参

            Program hanshu=new Program();
            //猴子
            //hanshu.hou();
            //Console.ReadLine();

            //输入班级人数，根据人数输入每个人的成绩
            //本班都是少数民族学生，每个人+10分
            //写一个专门+10分的函数，参数是这个分数的数组
            Console.WriteLine("请输入班级的人数");
            int renshu = int.Parse(Console.ReadLine());
            int[] fen = new int[renshu];
            for (int i = 0; i < renshu ;i++ )
            {
                Console.WriteLine("请输入第{0}名同学的成绩",(i+1));
                fen[i] = int.Parse(Console.ReadLine());
            }
            //for(int i=0;i <renshu ;i++)
            //{
            //    fen[i ]= hanshu.jiafen(fen[i]);
            //}

            //hanshu.jiafen2(fen );
            //hanshu.jiafen3(fen,out chengji);

            int []chengji=new int [renshu ];
            hanshu.jiafen3(fen,out chengji );
            foreach(int aa in chengji  )
            {
                Console.WriteLine(aa );
            }
            foreach (int aa in fen )
            {
                Console.WriteLine(aa);
            }
            Console.ReadLine();

        }
    }
}

split的使用