CODEWITHSUNDEEP
c#
WEL
WEL

Reputation: 31

How to add a mathematical operation to a List<>?

I'm sorry most of the program is in Spanish since that's my main language and it's a bit of a mess but it's short.

using System;
using System.Linq;
using System.Collections.Generic;

namespace Tarea_2
{
    class Demo
    {
        static void Main()
        {
            Console.Write("¿Cuántos números desea entrar? ");
              int cun = Int32.Parse(Console.ReadLine());
            Console.WriteLine();
            Console.WriteLine("Entre "+cun+" números");
            Console.WriteLine("Oprima 'Enter' después de cada uno.");
            //unaLista recoge los valores directamente del usuario
              List<int> unaLista = new List<int>();
              for (int i = 0; i < cun; i++)
                  unaLista.Add(Int32.Parse(Console.ReadLine()));
            Console.WriteLine();
            Console.Write("¿Qué cantidad desea sumar a cada número? ");
              int sum = Int32.Parse(Console.ReadLine());
            Console.WriteLine();
            //otraLista los copia de unaLista y les suma la variable "sum"
              **List<int> otraLista = new List<int>();
                          otraLista.AddRange(unaLista);**

            Mostrar(unaLista);
            Mostrar(otraLista);
        }//End of Main

        public static void Mostrar(List<int> a)
        {
            foreach (int valor in a)
                Console.WriteLine(valor);
                Console.WriteLine();
        }//End of Mostrar
    }//End of Demo
}//End of namespace

Anyway, I'm saving a variable that comes from the user on "sum" that I need to SUM to the total of each number that was copied to "otraLista" through AddRange from "unaLista". Is this possible?

edit: I always do these kind of things with arrays but this was my first time using Lists (since is supposed to be better), so many many thanks, this worked really nice:

List otraLista = unaLista.Select(i => i + sum).ToList();

Expected Results below:

¿Cuántos números desea entrar? 3

Entre 3 números. Oprima 'Enter' después de cada uno.

20

30

40

¿Qué cantidad desea sumar a cada número? 100

20

30

40

120

130

140

Press 'Enter' to finish...

Upvotes: 2

Views: 571

Answers (1)

Kendall Frey
Kendall Frey

Reputation: 44366

You can do this with LINQ:

otraLista = otraLista.Select(i => i + sum).ToList();

Or if you want to do it before the AddRange, you can skip the new List<int> and AddRange and do this instead:

List<int> otraLista = unaLista.Select(i => i + sum).ToList();

Make sure you are

using System.Linq;

Upvotes: 4

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