Initial commit

ConsoleApp1/HelloWorld.cs

@@ -0,0 +1,23 @@
+using System;
+namespace ConsoleApp1
+{
+    class HelloWorld
+    {
+        static void Main()
+        {
+            char ch=Console.ReadKey();
+            if (Char.ToUpper(ch)<= 'A' && Char.ToUpper(ch)<='Z')
+            {
+                if (ch >= 'A' && ch <= 'Z')
+                {
+                    Console.WriteLine("{0}是大写字母", ch);
+                }
+                else
+                {
+                    Console.WriteLine("{0}是小写字母", ch);
+                }
+            }
+            else if ()
+        }
+    }
+}