ver1.1 原来在自己仓库里写的，复制过来了。具体见博客

ConsoleApp1/ConsoleApp1.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

ConsoleApp1/ConsoleApp1.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29306.81
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp1", "ConsoleApp1.csproj", "{7B98FEA1-B76C-4862-BAAD-CFAFAC68F921}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7B98FEA1-B76C-4862-BAAD-CFAFAC68F921}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7B98FEA1-B76C-4862-BAAD-CFAFAC68F921}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7B98FEA1-B76C-4862-BAAD-CFAFAC68F921}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7B98FEA1-B76C-4862-BAAD-CFAFAC68F921}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {EFB82DE3-4B99-435C-8FF7-BD8D3B8E4B88}
+	EndGlobalSection
+EndGlobal

ConsoleApp1/Program.cs

@@ -0,0 +1,134 @@
+
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Yanyixiao
+{
+    public class Program
+    {
+
+        public class Formula
+        {
+            public string Form { get; internal set; }
+            public Queue<string> FormQueue = new Queue<string>();
+        }
+
+        public static string[] op = { "+", "-", "*", "/" };// Operation set
+        static void Main(string[] args)
+        {
+
+            int i;
+            System.Console.WriteLine("请输入需要的题目数量：");
+            int n = Convert.ToInt32(System.Console.ReadLine());
+            for (i = 0; i < n;)
+            {
+                Formula question = MakeFormula();
+                double ret = Solve(question);
+                if ((int)ret == ret && ret >= 0)
+                {
+                    System.Console.Write(question.Form);
+                    System.Console.Write("=");
+                    System.Console.WriteLine(ret);
+                    i++;
+                }
+            }
+
+        }
+
+
+        public static Formula MakeFormula()
+        {
+            Random ran = new Random();
+            Formula Form = new Formula();
+            string build = null;
+            int count = ran.Next(1, 3); // generate random count
+            int start = 0;
+            int number1 = ran.Next(1, 99);
+            build = build + number1;
+            Form.FormQueue.Enqueue(Convert.ToString(number1));//uytd 8796r756eu675v 786f876v
+
+            while (start <= count)
+            {
+                int operation = ran.Next(0, 4); ; // generate operator
+                int number2 = ran.Next(1, 99);
+                build = build + op[operation] + number2;
+                Form.FormQueue.Enqueue(op[operation]);
+                Form.FormQueue.Enqueue(Convert.ToString(number2));
+                start++;
+            }
+            Form.Form = build;
+            return Form;
+        }//Make a Formula(like 1*5+62-5)
+
+
+        public static double Solve(Formula formula)
+        {
+            Stack<double> numberStack = new Stack<double>();//Store number
+            Stack operatorStack = new Stack();//Store operator
+            while (!(formula.FormQueue.Count == 0))
+            {
+                if (!(formula.FormQueue.Peek() == "+" || formula.FormQueue.Peek() == "-"
+                   || formula.FormQueue.Peek() == "*" || formula.FormQueue.Peek() == "/"))//判断是否数字或者operator
+                {
+                    numberStack.Push(Convert.ToDouble(formula.FormQueue.Dequeue()));
+                }
+                else
+                {
+
+                    double X, Y;
+                    switch (formula.FormQueue.Dequeue())
+                    {
+                        case "*":
+                            X = numberStack.Pop();
+                            Y = Convert.ToDouble(formula.FormQueue.Dequeue());
+                            numberStack.Push(X * Y);
+                            goto First;
+
+                        case "/":
+                            X = numberStack.Pop();
+                            Y = Convert.ToDouble(formula.FormQueue.Dequeue());                                   /////Designed by Yanyixiao
+                            numberStack.Push(X / Y);                                                             /////09/18/2019
+                            goto First;
+
+
+                        case "+":
+                            operatorStack.Push("+");
+                            goto First;
+
+                        case "-":
+                            operatorStack.Push("-");
+                            goto First;
+                    }
+                First:;
+                }
+
+            }//乘除法计算完毕
+            while (numberStack.Count > 1)
+            {
+
+                switch (operatorStack.Peek())
+                {
+                    case "+":
+                        numberStack.Push((Convert.ToDouble(numberStack.Pop()) + Convert.ToDouble(numberStack.Pop())));
+                        goto Second;
+
+                    case "-":
+                        double X, Y;
+                        X = Convert.ToDouble(numberStack.Pop());
+                        Y = Convert.ToDouble(numberStack.Pop());
+                        numberStack.Push(Y - X);
+                        goto Second;
+
+                }
+            Second:;
+
+
+
+            }
+            return numberStack.Pop();
+        }
+    }
+}
+