using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace dna2rna

{

    class Program

    { 

        static Random rnd = new Random();

        static string dna;

        static string rna;

        static void Main(string[] args)

        {

            dna = genereerdna(26);

            System.Text.StringBuilder strBuilder = new System.Text.StringBuilder(dna);

            for (var i = 0;i<dna.Length;i++)

            {

                if (dna[i] == 't')

                {

​

                     strBuilder[i] = 'u';

                    rna = strBuilder.ToString();

                }

            }

            Console.WriteLine("dna:");

            Console.WriteLine(dna);

            Console.WriteLine("rna:");

            Console.WriteLine(rna);

        }

        static string genereerdna(int aantal)

        {

             string dna ="";

            for ( var i = 0; i < aantal;i++)

            {

                int x = rnd.Next(1,5);

                if (x == 1)

                {

                    dna += "a";

                }

                else if (x == 2)

                {

                    dna += "c";

                }

                else if (x == 3)

                {

                    dna += "g";

                }

                else 

                {

                    dna +="t";

                }

            }

            return dna;

         }

        }

    }

​

​