Synchronization of old projects

Part1

C#基础/Lesson11_递归函数练习/Program.cs

@@ -0,0 +1,80 @@
+using System;
+namespace Lesson
+{
+    class Program
+    {
+        #region 练习题一 课上有不写了
+        #endregion
+
+
+
+        #region 练习题二
+        static int JieCheng(int max)
+        {
+            if (max == 0)
+            {
+                return 1;
+            }
+            else 
+            { 
+                return max * JieCheng(max - 1); 
+            }
+                
+        }
+
+        #endregion
+
+
+
+        #region 练习题三
+        static int JieChengHe(int num)
+        {
+            if (num == 1)
+            {
+                return JieCheng(1);
+            }
+            return JieCheng(num) + JieChengHe(num-1);
+        }
+        #endregion
+
+
+
+        #region 练习题四
+        static void Bamboo(float length, int day)
+        {
+            Console.WriteLine("长度为" + length);
+            length /= 2;
+            day--;
+            if (day < 0)
+            {
+                Console.WriteLine("长度为" + length);
+                return;
+            }
+            Bamboo(length, day);
+        }
+        #endregion
+
+
+        #region 练习题五
+        static bool Fun(int num)
+        {
+            Console.WriteLine(num);
+            return num == 200 || Fun(num + 1);
+        }
+        #endregion
+
+
+
+
+        static void Main(string[] args)
+        {
+            Console.WriteLine(JieCheng(5));
+
+            Console.WriteLine(JieChengHe(10));
+
+            Bamboo(100,10);
+
+            Fun(0);
+        }
+    }
+}