Initial commit

C Sharp 1_3/Program.cs

@@ -0,0 +1,47 @@
+using System;
+using static System.Math;
+namespace C_Sharp_1_3
+{
+    public class Program
+    {
+        static void Main()
+        {
+            Console.WriteLine("请输入变量x的值：");
+            double x = double.Parse(Console.ReadLine());
+            double y;
+            // 单句单分支方法
+            y = Log(-5 * x) + 6 * Sqrt(Abs(x) + Exp(4)) - Pow((x + 1), 3);
+            if (x>=0)
+            {
+                y = (Pow(x, 2) - 3 * x) / (Pow(x, 2) + 1) + 2 * PI + Sin(x);
+            }
+            Console.WriteLine("方法一，x={0},y={1}",x,y);
+
+            // 两句单分支方法
+            if (x >= 0)
+            {
+                y = (Pow(x, 2) - 3 * x) / (Pow(x, 2) + 1) + 2 * PI + Sin(x);
+            }
+            if(x < 0)
+            {
+                y = Log(-5 * x) + 6 * Sqrt(Abs(x) + Exp(4)) - Pow((x + 1), 3);
+            }
+            Console.WriteLine("方法二，x={0},y={1}", x,y);
+
+            // 双分支方法
+            if (x >= 0)
+            {
+                y = (Pow(x, 2) - 3 * x) / (Pow(x, 2) + 1) + 2 * PI + Sin(x);
+            }
+            else
+            {
+                y = Log(-5 * x) + 6 * Sqrt(Abs(x) + Exp(4)) - Pow((x + 1), 3);
+            }
+            Console.WriteLine("方法三，x={0},y={1}",x,y);
+
+            // 条件运算符方法
+            y = (x >= 0) ? (Pow(x, 2) - 3 * x) / (Pow(x, 2) + 1) + 2 * PI + Sin(x) : Log(-5 * x) + 6 * Sqrt(Abs(x) + Exp(4)) - Pow((x + 1), 3);
+            Console.WriteLine("方法四，x={0},y={1}",x,y);
+        }
+    }
+}