Intuit // C# // listing_4.7 (case // calculator), C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.IO;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
           //Your code goes here
            string buf;
            double a,b,res;
            Console.Write("Enter the first operand: ");
            a = double.Parse(Console.ReadLine());
            Console.WriteLine(" a = {0,5}", a);
            Console.Write("Enter the operation sign:");
            char op = (char)Console.Read();
            Console.ReadLine();
            Console.WriteLine(" op = {0,5}", op);
            Console.Write("Enter the second operand: ");
            b = double.Parse(Console.ReadLine());
            Console.WriteLine(" b = {0,5}", b);
            bool ok = true;
            switch (op){
             case '+' : res = a+b; break;   
             case '-' : res = a-b; break;
             case '/' : res = a/b; break;
             case '*' : res = a*b; break;
             case '^' : res = Math.Pow(a,b); break;
             default : res = double.NaN; ok = false; break;
             }
            if (ok) Console.WriteLine("Result is = " + res);
            else Console.WriteLine("ERROR");
            
        }
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0,14 sec, absolute running time: 0,08 sec, cpu time: 0,06 sec, average memory usage: 12 Mb, average nr of threads: 3