Initial commit

cs3/C_Sharp_3_1/Program.cs

@@ -0,0 +1,36 @@
+using System;
+namespace C_Sharp_3_1
+{
+    public class Program
+    {
+        static void Main()
+        {
+            int n = -1, result = 1, i = 1;
+            Console.WriteLine("请输入一个正整数n");
+            while (n < 0)
+            {
+                n = int.Parse(Console.ReadLine());
+            }
+            // For循环实现阶乘
+            for (i = 1; i <= n; i++)
+            {
+                result *= i;
+            }
+            Console.WriteLine("for 循环 {0}！={1}", n, result);
+            // while循环实现阶乘
+            while (n > 1)
+            {
+                result *= n;
+                n--;
+            }
+            Console.WriteLine("while 循环 {0}！={1}", n, result);
+            //do...while循环实现阶乘
+            do
+            {
+                result *= i;
+                i ++;
+            } while (i<=n);
+            Console.WriteLine("do...while 循环 {0}！={1}", n, result);
+        }
+    }
+}