Windows application issue in array sum

Given an array initialized with numbers, how can I add all of its elements without using LINQ or foreach?

My incomplete code is as follows:

namespace WindowsApplication5
{
   public partial class Form1 : Form
   {
      public Form1()
      {
         InitializeComponent();
      }

      public void Form1_Load(object sender, EventArgs e)
      {
         method1(sum1);
         MessageBox.Show("The Sum Is = " + sum1.ToString(), "Addition",MessageBoxButtons.OK,MessageB…
      }
      int sum1;
      int[] str = new int[4] { 1, 2, 3, 4 }; // i want to add this 4 values and to be printed on a messagebox//

      public int method1(int str)
      {
          sum1 = str;
          return sum1;
      }
   }
}

The output is showing "the sum is = 0", in开发者_Go百科stead of 10.

Thank you.

P.S: I don't want to use LINQ or foreach.

For a start you have global variables which are bad. Without using LINQ or Foreach as you mentioned, try something like:

//Doesn't have to be a button click...just an example.
private void button1_Click(object sender, EventArgs e)
{
   int[] values = new int[4] { 1, 2, 3, 4 };
   int result = Sum(values);
   MessageBox.Show(result.ToString());
}

int Sum(int[] values)
{
   int sum= 0;
   for (int i = 0; i < values.Length; ++i)
   {
       sum += values[i];
   }
   return sum;
}

The simplest options that don't use foreach or LINQ would be to use either a for loop or recursion. The recursive solution:

int Sum(int[] arr, int index = 0, int current = 0)
{
  if(index == arr.Length)
    return current;
  return Sum(arr, index+1, current+arr[index]);
}

Using a for loop:

int Sum(int[] arr)
{
  int result = 0;
  for(int i = 0; i<arr.Length; i++)
    result+=arr[i];
  return result;
}

To take the sum of an array, you can simply say: int sum = myArray.Sum();

To do so you need to have: using System.Linq since that's where the Sum extension method is defined.

If you don't have linq, then how about:

private int CalculateSum(int[] arr){
   int total = 0;
   foreach(int i in arr)
      total += i;
   return total;
}

I'm curious about why you're opposed to a for loop. Could you enlighten us?

Unless I'm missing something, it seems like you've got two options:
1) use an existing method (in this case it would be the .Sum() method, in LINQ), or
2) write a method yourself to compute the sum (that would be the foreach loop)