C# out的使用 函数例题

 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 -  * a * c;
             if (de < )
             {
                 Console.WriteLine("函数没有实根");
                 j1 = j2 = "";

             }
             else
             {
                 double x1 = (-b + Math.Sqrt(de)) / ( * a);
                 double x2 = (-b - Math.Sqrt(de)) / ( * a);
                 if (de == )
                 {
                     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 = ;
             for (int i = ; i > ; i--)
             {
                 if (i == )
                 {
                     sum = ;
                 }
                 else
                 {
                     sum = (sum + ) * ;
                 }
             }
             Console.Write(sum);
         }

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

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

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

         public void  jiafen3(int[] a, out int[] b)
         {
             int l = a.Length;
             for (int i = ; i < l; i++)
             {
                 a  [i] = a[i] + ;
             }
             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 = ; i < renshu ;i++ )
             {
                 Console.WriteLine("请输入第{0}名同学的成绩",(i+));
                 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();

         }
     }
 }