Initial commit

ConsoleApp4/ConsoleApp4.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ConsoleApp4/ConsoleApp4.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36518.9 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp4", "ConsoleApp4.csproj", "{39F1C705-82C1-47BA-9300-27AD2CAC80CB}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{39F1C705-82C1-47BA-9300-27AD2CAC80CB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{39F1C705-82C1-47BA-9300-27AD2CAC80CB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{39F1C705-82C1-47BA-9300-27AD2CAC80CB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{39F1C705-82C1-47BA-9300-27AD2CAC80CB}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B9781DF7-01FC-404C-9946-2CB8FC2DBEB9}
+	EndGlobalSection
+EndGlobal

ConsoleApp4/Program.cs

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+//namespace ConsoleApp4
+//{
+//    internal class Program
+//    {
+//        static void Main(string[] args)
+//        {
+//            int[] myarry = new int[3] { 10, 20, 30 };
+//            Console.WriteLine(myarry);
+//            foreach (int item in myarry)
+//            {
+//                Console.Write(item + " ");
+//            }
+//            Console.ReadLine();
+//        }
+//    }
+//}

ConsoleApp4/p2.cs

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+using System;
+
+namespace ConsoleApp4
+{
+    public class p2
+    {
+        public static void Displaymatrix(int[,] A)
+        {
+            for (int i = 0; i < A.GetLength(0); i++)
+            {
+                for (int j = 0; j < A.GetLength(1); j++)
+                {
+                    Console.Write("{0,6}", A[i, j]);
+                }
+                Console.WriteLine();
+            }
+        }
+    static void Main()
+        {
+            int i, j, sum = 0, t;
+            int[,] A = new int[4, 4];
+            for (i = 0; i < 4; i++) {
+                for (j = 0; j < 4; j++)
+                {
+                    A[i, j] = i * 4 + j + 1;
+                }
+            }
+            Console.WriteLine("原始矩阵："); Displaymatrix(A);
+            Console.WriteLine("上三角矩阵：");
+            for (i = 0; i < 4; i++)
+            {
+                for (int k = 0; k < i * 7; k++) Console.Write(" ");
+                for (j = i; j < 4; j++) Console.Write("{0,6} ", A[i, j]);
+                Console.WriteLine();
+            }
+            Console.WriteLine("下三角矩阵");
+            for (i = 0; i < 4; i++)
+            {
+                for (j = 0; j < i+1; j++) Console.Write("{0,6}", A[i, j]);
+                Console.WriteLine();
+            }
+            Console.WriteLine("两条对角线之和");
+            for (i = 0; i < 4; i++) sum += A[i, i] + A[i, 3 - i];
+            Console.WriteLine("{0,6}", sum);
+            Console.WriteLine("矩阵A转置：");
+            for (i = 0; i < 4; i++)
+            {
+                for (j = i; j < 4; j++)
+                {
+                    t = A[i, j];
+                    A[i, j] = A[j, i];
+                    A[j, i] = t;
+                }
+            }
+            Displaymatrix(A);
+            Console.ReadLine();
+        }
+    } 
+}
+

ConsoleApp4/p3.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp4
+{
+    internal class p3
+    {
+    }
+}