C# out的使用 函数例题

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6
 7 namespace OUT函数
 8 {
 9     class Program
10     {
11         //public void outzhi(double a, double b, double c, out double j1, out double j2)
12         public void outzhi(double a, double b, double c, out string  j1, out string  j2)
13         {
14             double de = b * b - 4 * a * c;
15             if (de < 0)
16             {
17                 Console.WriteLine("函数没有实根");
18                 j1 = j2 = "";
19
20             }
21             else
22             {
23                 double x1 = (-b + Math.Sqrt(de)) / (2 * a);
24                 double x2 = (-b - Math.Sqrt(de)) / (2 * a);
25                 if (de == 0)
26                 {
27                     Console.WriteLine("方程有两个相同的实根");
28                     j1 = j2 = x1.ToString();
29                 }
30                 else
31                 {
32                     Console.WriteLine("方程有两个不同的实根");
33                     //Console.Write("x1=" + x1); Console.Write("  x2=" + x2);
34                     j1 = x1.ToString();
35                     j2 = x2.ToString();
36                 }
37             }
38
39         }
40
41
42         static void Main(string[] args)
43         {
44             Program hanshu = new Program();
45             Console.Write("请输入a=");
46             double a = double.Parse(Console.ReadLine());
47             Console.Write("请输入b=");
48             double b = double.Parse(Console.ReadLine());
49             Console.Write("请输入c=");
50             double c = double.Parse(Console.ReadLine());
51             //double j1 = 0;
52             //double j2 = 0;
53             string j1 = "";
54             string j2 = "";
55             hanshu.outzhi(a, b, c, out j1, out j2);
56             Console.WriteLine("第一个根x1=" + j1);
57             Console.Write("第二个根x2=" + j2);
58             Console.ReadLine();
59
60         }
61     }
62 }

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6
  7 namespace _0630下午
  8 {
  9     class Program
 10     {
 11         public void  hou()
 12         {
 13             int sum = 0;
 14             for (int i = 10; i > 0; i--)
 15             {
 16                 if (i == 10)
 17                 {
 18                     sum = 1;
 19                 }
 20                 else
 21                 {
 22                     sum = (sum + 1) * 2;
 23                 }
 24             }
 25             Console.Write(sum);
 26         }
 27
 28         public int jiafen(int  a)
 29         {
 30             a+= 10;
 31             return a;
 32         }
 33
 34         public void jiafen2(int[] a)
 35         {
 36             int l= a.Length;
 37             for (int i = 0; i < l; i++)
 38             {
 39                 a[i] += 10;
 40             }
 41         }
 42
 43         public int [] jiafen4(int[] a)
 44         {
 45             int l = a.Length;
 46             for (int i = 0; i < l; i++)
 47             {
 48                 a[i] += 10;
 49             }
 50             return a;
 51         }
 52
 53         public void  jiafen3(int[] a, out int[] b)
 54         {
 55             int l = a.Length;
 56             for (int i = 0; i < l; i++)
 57             {
 58                 a  [i] = a[i] + 10;
 59             }
 60             b = a;
 61         }
 62
 63         static void Main(string[] args)
 64         {
 65             //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）
 66             //out是实参
 67
 68             Program hanshu=new Program();
 69             //猴子
 70             //hanshu.hou();
 71             //Console.ReadLine();
 72
 73             //输入班级人数，根据人数输入每个人的成绩
 74             //本班都是少数民族学生，每个人+10分
 75             //写一个专门+10分的函数，参数是这个分数的数组
 76             Console.WriteLine("请输入班级的人数");
 77             int renshu = int.Parse(Console.ReadLine());
 78             int[] fen = new int[renshu];
 79             for (int i = 0; i < renshu ;i++ )
 80             {
 81                 Console.WriteLine("请输入第{0}名同学的成绩",(i+1));
 82                 fen[i] = int.Parse(Console.ReadLine());
 83             }
 84             //for(int i=0;i <renshu ;i++)
 85             //{
 86             //    fen[i ]= hanshu.jiafen(fen[i]);
 87             //}
 88
 89             //hanshu.jiafen2(fen );
 90             //hanshu.jiafen3(fen,out chengji);
 91
 92             int []chengji=new int [renshu ];
 93             hanshu.jiafen3(fen,out chengji );
 94             foreach(int aa in chengji  )
 95             {
 96                 Console.WriteLine(aa );
 97             }
 98             foreach (int aa in fen )
 99             {
100                 Console.WriteLine(aa);
101             }
102             Console.ReadLine();
103
104
105
106         }
107     }
108 }