Can't print index and sum of an array

Question

I have homework. I have to make a program which can input the length of an array with the value in it. After I click the "process" button, the program will make an output of index and value with the result sum and average from the array.

I'm stuck and couldn't print the index and the value to the multiple textbox below process button.

I'm expecting the output will look like this:

Here's the code which I'd been successful write so far:

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

        private void process_Click(object sender, EventArgs e)
        {

            int sum = 0;
            string ind = "index";
            string message;
            int count = Convert.ToInt32(inputArray.Text);
            int[] varray = new int[count];
            for (int i=1; i <= count; i++)
            {
                varray[i] = Convert.ToInt32(Interaction.InputBox(message="enter the value of array number "+i));
                sum += varray[i];
            }
            boxSum.Text = Convert.ToString(sum);
        }
    }
}

Please, help me.

Array index is Zero based .. You should loop from 0 even if you display index +1 . — xdtTransform, Sep 17 '19 at 09:06
https://stackoverflow.com/questions/2419343/how-to-sum-up-an-array-of-integers-in-c-sharp — xdtTransform, Sep 17 '19 at 09:08
And to add line to the multiline textbox = > [How to add a line to a multiline TextBox?](https://stackoverflow.com/questions/8536958/how-to-add-a-line-to-a-multiline-textbox) — xdtTransform, Sep 17 '19 at 09:10
The array variable should be in the Form1 not local to `process_Click` as many element in your form will like to have access to the input/array. — xdtTransform, Sep 17 '19 at 09:14

score 0 · Answer 1 · answered Sep 17 '19 at 09:35

Here is the code for you (boxAvg is for average)

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

        private void process_Click(object sender, EventArgs e)
        {

            int sum = 0;
            string ind = "index";
            string message;
            int count = Convert.ToInt32(inputArray.Text);
            int[] varray = new int[count];
            for (int i=1; i <= count; i++)
            {
                varray[i-1] = Convert.ToInt32(Interaction.InputBox(message="enter the value of array number "+i));
                sum += varray[i-1];
            }
            //Refer your list box here to add newly added values to the list
            boxSum.Text = Convert.ToString(sum);
            boxAvg.Text = Convert.ToString(sum / count);  //calculate the average
        }
    }
}

xdtTransform · Answer 2 · 2019-09-17T09:46:51.623

Given that the array already has data :

private void Display()
{
    var columnHeader1 = "Index    Value\n";
    multilineTextBox1.Text = 
        columnHeader1 +
        string.Join("\n", vArray.Select((x,i)=> $"{i+1,5}    {x,5}"));


    boxSum.Text = vArray.Sum(); 
    boxAvg.Text = vArray.Average();


    var columnHeader2 = "Index    Value    Histogram\n";
    multilineTextBox2.Text = 
        columnHeader2 + 
        string.Join("\n", vArray.Select((x,i)=> $"{i+1,5}    {x,5}    {new String('*', x)}"));
}

String.Join(separator, string[]), To join each row with a Carriage return/Line feed.
.Select((x,i)=> (...), To get each elment of the array an its index.
$"", For the easy string interpolation
{i+1,5}, To display the index i padded on 5 char.
new String('*', x)}, To create a string of N time the same char.

Console demo

Can't print index and sum of an array

2 Answers2