C# programming exercise 2, 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;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
          
            Console.WriteLine("What is the correct way to declare a variable to store an integer value in C#?");
            Console.WriteLine("a. int 1x=10");
            Console.WriteLine("b. int x=10");
            Console.WriteLine("c. float x=10");
            Console.WriteLine("d. string x=\"10\"");
            
            char not;
            Console.WriteLine("Chose the correct letter");
            not = (char) Console.Read();
            
            switch(not)
            {
                case'a':
            Console.WriteLine("Wrong answer");
            break;
                case'b':
            Console.WriteLine("Correct answer");
            break;
                case'c':
            Console.WriteLine("Wrong answer");
            break;
                
            case'd':
            Console.WriteLine("Wrong answer");
            break;
            
            default:
            Console.WriteLine("Invalid answer");
                break;
            }
            
        }
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 15 Mb, average nr of threads: 3