Pass multiple numbers into an Add method that uses a params modifier?

Question

Refer to this answer: Pass multiple optional parameters to a C# function Question about Params (to a point). What I want to know is, how (if possible) can this be used to take user input rather than predefined numbers? So, I understand that I can do Console.Write(calculator.Add(1, 43, 23)) but would like to deal with user input.

class Program
{
    static void Main(string[] args)
    {
        var calculator = new Calculator();
        var input = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(calculator.Add(input));
    }
}

public class Calculator
{
    public int Add(params int[] numbers)
    {
        var sum = 0;
        foreach (var number in numbers)
        {
            sum += number;
        }
        return sum;
    }
}

score 0 · Answer 1 · edited Jun 03 '18 at 00:57

0

You can store all the user inputs in an array and pass the array to Add.

var calculator = new Calculator();
var input = Array.ConvertAll<int>(Console.ReadLine().Split(' '));
calculator.Add(input);

edited Jun 03 '18 at 00:57

AustinWBryan

3,249
3
24
42

answered Jun 02 '18 at 20:03

Test12345

1,625
1
12
21

`ConvertAll` needs 2 parameters – Slai Jun 02 '18 at 20:25
Wish I knew what type of variable `input` was. – AustinWBryan Jun 02 '18 at 23:01

Eddie D · Accepted Answer · 2018-06-02T20:19:01.270

-2

Something along these lines should work. I might have made syntax errors :D

using System;
class Program
{
    static void Main(string[] args)
    {
        var calculator = new Calculator();
        var input = GetNumbers();
        calculator.Add(input);
        Console.WriteLine(calculator.Add(input));
    }

    public static int[] GetNumbers()
    {
      Console.WriteLine("Enter Numbers Seperated With a Space");
      string input = Console.ReadLine(); //Get user input with this
      string[] arr = input.Split(' '); //Split the input at spaces
      int[] output = new int[arr.Length]; //create in array of same length

      for(int i = 0; i < output.Length; i++)
      {
          output[i] = Int32.Parse(arr[i]); //parse every value and add to int array
      }
      return output;
    }
}

public class Calculator
{
    public int Add(params int[] numbers)
    {
        var sum = 0;
        foreach (var number in numbers)
        {
            sum += number;
        }
        return sum;
    }
}

edited Jun 02 '18 at 20:19

answered Jun 02 '18 at 20:02

Eddie D

1,120
7
16

Thanks, I'll look at this. Any idea why my question has been downvoted? I don't understand, its a legitimate question. This site does dismay me sometimes. What is its point if not for people like me to come and learn from it, and gain others knowledge. – wilfy Jun 02 '18 at 22:21
Just to say that in this as well as the OP, there's an unnecessary line of `calculator.Add(input);` before the `Console.WriteLine(calculator.Add(input));`. OP may be interested in putting in a variable where the result is to be re-used. – MacroMarc Jun 02 '18 at 23:03
Macro, yes I should have edited the code a little before posting. I left that line in as was because I was in the middle of changes. I'll edit. – wilfy Jun 03 '18 at 10:11

Pass multiple numbers into an Add method that uses a params modifier?

2 Answers2