Computing sum for an array outside newb

Question

I've figured out how to do most of what I need. I realize that the variables used in the for loops will not be reachable outside of the loop, but I need to display the sum of the integers the user puts in. So,

step 1: Asks user for input of number of integers.

Step 2: Runs through getting each integer.

Step 3: Then displays all input.

And step 4: should have the sum of step 3...and that's

where my issue is.

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

namespace Dynamic_Entry
{
    class Program
    {
        static void Main()
        {
            Console.Write("How many integers are in your list? ");
            int k = Convert.ToInt32(Console.ReadLine());
            int[] a = new int[k];
            int sum = 0;

            for (int i = 0; i < a.Length; i++)
            {
                Console.Write("Please enter an integer: ");
                a[i] = Convert.ToInt32(Console.ReadLine());
            }
            for (int n = 0; n < a.Length; n++)
            {
                Console.WriteLine("{0, 5}", a[n]);
            }
            Console.WriteLine("-----");

            sum += [] a;
            Console.Write("{0, 5}", sum);
            Console.ReadLine();
        }
    }
}

Any help on how to get the sum from outside the loop? If I put the hyphen line inside the last loop, it'll keep putting lines after every number...I only need the line at the end, with the sum under it. Thanks!

You can declare int sum = 0; up top, then sum += a[i]; as you read them in. — rutter
– rutter, Commented Aug 2, 2013 at 5:44
I can't add the addition into the loop, because then it makes the output wrong. The final sum is displayed after the hyphen line, which is outside of the loop. If the hyphen line was inside the loop, I'd get a line after every integer entered. — user1707042
– user1707042, Commented Aug 2, 2013 at 5:49
Because it had to be a certain format. Having a line under every integer entered was not the format the output was supposed to have. The program displays all integers in a neat row, then has the hyphen line, then displays the sum. — user1707042
– user1707042, Commented Aug 2, 2013 at 6:45

Harris Yer · Accepted Answer · 2013-08-02 05:41:46Z

3

Since you can used linq, replace the sum with bellow

 Console.WriteLine("-----");
    sum = a.Sum(); 
 Console.Write("{0, 5}", sum);

answered Aug 2, 2013 at 5:41

Harris Yer

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11 Comments

user1707042 Over a year ago

This is EXACTLY what I needed. Can you explain how the array a still keeps the value of the array while it is in the different loops?

Atish Kumar Dipongkor Over a year ago

Same answer I gave before this answer.

Atish Kumar Dipongkor Over a year ago

U are just iterating the array not changing the value of the array. That's why Same values are being kept. Very common sense

Harris Yer Over a year ago

Hi Atish Dipongkor, sorry to duplicate your answer, because when i submit the answer the time, your answer not yet show out, cause just 4 min different.

user1707042 Over a year ago

Atish, your original answer was to use Array.Sum, which did not exist. a.Sum did, and that is what Harris posted first.

|

Atish Kumar Dipongkor · Accepted Answer · 2013-08-02 06:19:00Z

2

You may use

a.Sum()

method of Linq.

And your code should look like following

static void Main()
        {
            Console.Write("How many integers are in your list? ");
            int k = Convert.ToInt32(Console.ReadLine());
            int[] a = new int[k];
            int sum = 0;

            for (int i = 0; i < a.Length; i++)
            {
                Console.Write("Please enter an integer: ");
                a[i] = Convert.ToInt32(Console.ReadLine());
            }
            for (int n = 0; n < a.Length; n++)
            {
                Console.WriteLine("{0, 5}", a[n]);
            }
            Console.WriteLine("-----");

            Console.Write("{0, 5}", a.Sum());
            Console.ReadLine();
        }

edited Aug 2, 2013 at 6:19

answered Aug 2, 2013 at 5:36

Atish Kumar Dipongkor

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4 Comments

user1707042 Over a year ago

I don't have a Apply.Sum option in my Visual Studio. This is a console application, btw.

Atish Kumar Dipongkor Over a year ago

I didn't tell u to use Apply.Sum(). I told u to use Array.Sum(). Your accepted answer was given after my answer. What's the problem with my answer. Seems something wrong here

user1707042 Over a year ago

I didn't have Array.Sum, simple misspelling. In other words, when I tried your code, it didn't work. When I tried Harris', it did. No hard feelings.

Atish Kumar Dipongkor Over a year ago

Man ..... Array.Sum() is a method of LINQ. That means you can use Sum() method with your Array

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