Synchronization of old projects

Part1

C#基础/Lesson2_数组练习/Lesson2_一维数组练习.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>

C#基础/Lesson2_数组练习/Program.cs

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+#region 练习题一
+int[] array = new int[100];
+for (int i = 0; i < array.Length; i++)
+{
+    array[i] = i;
+    Console.Write(array[i] + " ");
+}
+Console.ReadKey();
+Console.Clear();
+#endregion
+
+
+#region 练习题二
+int[] array2 = new int[100];
+for (int i = 0; i < array2.Length; i++)
+{
+    array2[i] = array[i]*2;
+    Console.Write(array2[i] + " ");
+}
+Console.ReadKey();
+Console.Clear();
+#endregion
+
+
+#region 练习题三
+int[] array3 = new int[100];
+Random r = new Random();
+for (int i = 0; i < array3.Length; i++)
+{
+    array3[i] = r.Next(0,101);
+    Console.Write(array3[i] + " ");
+}
+Console.ReadKey();
+Console.Clear();
+#endregion
+
+
+#region 练习题四
+int[] array4 = new int[100];
+int max=0, min=100, sum=0, avg=0;
+for (int i = 0; i < array4.Length; i++)
+{
+    array4[i] = r.Next(0, 101);
+    if(max < array4[i])
+    {
+        max = array4[i];
+    }
+    if(min > array4[i])
+    {
+        min = array4[i];
+    }
+    sum += array4[i];
+    avg = sum / array4.Length;
+    Console.Write(array4[i] + " ");
+}
+Console.WriteLine();
+Console.WriteLine($"最大值为：{max}");
+Console.WriteLine($"最小值为：{min}");
+Console.WriteLine($"总和为：{sum}");
+Console.WriteLine($"平均值为：{avg}");
+Console.ReadKey();
+Console.Clear();
+#endregion
+
+
+#region 练习题五
+int[] array5 = new int[10];
+for (int i = 0; i < array5.Length; i++)
+{
+    array5[i] = r.Next(0, 101);
+    Console.Write(array5[i] + " ");
+}
+//反转
+int temp;
+for (int i = 0; i < array5.Length / 2; i++)
+{
+    temp = array5[i];
+    array5[i] = array5[array5.Length - 1 - i];
+    array5[array5.Length - 1 - i] = temp;
+    
+}
+Console.WriteLine();
+Console.WriteLine("反转后：");
+for (int i = 0; i < array5.Length; i++)
+{
+    Console.Write(array5[i] + " ");
+}
+Console.WriteLine();
+Console.WriteLine("反打反转：");
+for (int i = array5.Length - 1; i >= 0; i--)
+{
+    Console.Write(array5[i] + " ");
+}
+Console.ReadKey();
+Console.Clear();
+#endregion
+
+
+#region 练习题六
+int[] array6 = new int[10];
+for (int i = 0; i < array6.Length; i++)
+{
+    array6[i] = r.Next(-10, 11);
+    Console.Write(array6[i] + " ");
+}
+for (int i = 0;i < array6.Length; i++)
+{
+    if (array6[i] < 0)
+    {
+        array6[i] -= 1;
+    }
+    else if (array6[i] > 0)
+    {
+        array6[i] += 1;
+    }
+}
+Console.WriteLine();
+Console.WriteLine("处理后：");
+for (int i = 0; i < array6.Length; i++)
+{
+    Console.Write(array6[i] + " ");
+}
+Console.ReadKey();
+Console.Clear();
+#endregion
+
+
+#region 练习题七
+int[] array7 = new int[10];
+try
+{
+    for (int i = 0; i < array7.Length; i++)
+    {
+        Console.Write($"请输入第{i + 1}位同学的成绩：");
+        array7[i] = int.Parse(Console.ReadLine());
+
+    }
+}
+catch
+{
+    Console.WriteLine("输入错误，请输入数字！");
+    return;
+}
+max = array7[0];
+min = array7[0];
+sum = 0;
+avg = 0;
+for (int i = 0; i < array7.Length; i++)
+{
+    if (max < array7[i])
+    {
+        max = array7[i];
+    }
+    if (min > array7[i])
+    {
+        min = array7[i];
+    }
+    sum += array7[i];
+}
+avg = sum / array7.Length;
+Console.WriteLine($"成绩最高成绩为{max}");
+Console.WriteLine($"成绩最低成绩为{min}");
+Console.WriteLine($"成绩总和成绩为{sum}");
+Console.WriteLine($"平均成绩成绩为{avg}");
+for (int i = 0; i < array7.Length; i++)
+{
+    if (array7[i] >= 60)
+    {
+        Console.WriteLine($"第{i + 1}位同学成绩为：{array7[i]}，成绩合格");
+    }
+    else
+    {
+        Console.WriteLine($"第{i + 1}位同学成绩为：{array7[i]}，成绩不合格");
+    }
+}
+#endregion
+
+
+#region 练习题八
+string[] array8 = new string[25];
+for (int i = 0; i < array8.Length; i++)
+{
+    //if (i % 2 == 0)
+    //{
+    //    array8[i] = "■";
+    //}
+    //else
+    //{
+    //    array8[i] = "□";
+    //}
+    array8[i] = i % 2 == 0 ? "■" : "□";//无敌
+    //打印
+    Console.Write(array8[i]);
+    if ((i + 1) % 5 == 0)
+    {
+        Console.WriteLine();
+    }
+}
+#endregion