How can I read numbers from a textfile and output sum for each line from a textfile

Question

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Read in a series of numbers from a text-file (the data is given below). For each row in the file, setup a thread to calculate the sum of the values of that vector. Each of the vector sums must then be written to a new file, sorted in ascending order.
Input files contents:
6,12,2,9,17
7,3,15,19,4
10,5,8,21,13

What I have tried:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System;
using System.IO;

namespace Test1
{
    class Program
    {
        static void Main(string[] args)
        {
            string filePath = @"C:Test.txt";
            string line;

            if (File.Exists(filePath))
            {
                StreamReader file = null;
                try
                {
                    file = new StreamReader(filePath);
                    while ((line = file.ReadLine()) != null)
                    {
                        Console.WriteLine(line);
                    }
                }
                finally
                {
                    if (file != null)
                        file.Close();
                }
            }

            Console.ReadLine();
        }
    }
    
}

Posted 31-May-17 23:48pm

Samkelo Siyabonga Ngubo

Updated 1-Jun-17 11:13am

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Comments

F-ES Sitecore 1-Jun-17 5:57am

First off we're not here to do your homework for you. Second off just dumping your code and not even explaining what the issue is is not going to get you help anyway,

Samkelo Siyabonga Ngubo 1-Jun-17 5:59am

Have you read my question and have you checked what I have tried?

F-ES Sitecore 1-Jun-17 6:13am

That's not your question, that is the homework cut and pasted, as it is phrased as a command or instruction, not a question. It is written a command because it is commanding you to do the work.

Samkelo Siyabonga Ngubo 1-Jun-17 6:18am

this is from my solution and its gives me output from text file but it doesn't gives me the sum of each line

F-ES Sitecore 1-Jun-17 6:22am

All your code does is read the file line by line and do nothing with it. You'll need to split each line into its individual numbers and add those numbers up. Further more you'll need to do each line on a new thread then have some mechanism of knowing when all of the threads have finished their work, collecting the results and creating a file with them in order, so you still have a lot of work to do.

Ralf Meier 1-Jun-17 6:34am

I completely agree with F-ES Sitecore, because you haven't tried anything donig something with the imported line (except writing it to the console).
But ... and that is very good ... you recognized that the imported line is a String - congratulations.
So - I suggest : do something with this line. Perhaps you try to understand what F-ES Sitecore has written in his last reply ... (look at the word 'split' and then think how the parts could be added - could strings be added in their value ?)

2 solutions

Solution 1

This is your homework - so I won't give you the code.
I wouldn't bother with a StreamReader:

C#

string[] lines = File.ReadAllLines(pathToFile);

Will do it fine. You can then use a foreach loop to process each string.
Inside the loop, set up a thread (a BackgroundWorker is probably the easiest way) to process each line.
In the thread use string.Split to break the line on each comma:

C#

string[] parts = line.Split(',');

You can then use int.TryParse on each string to convert it to a number.
You can then work out the vector sum and return it to the main thread.
The main thread assembles all the sums, aggregates them in a collection, sorts the collection, and writes them to the new file.

Do it a bit at a time, and it's all pretty simple stuff!

Posted 1-Jun-17 0:54am

OriginalGriff

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Samkelo Siyabonga Ngubo · Accepted Answer · 2017-06-01T11:13:00

Thank I did my homework here is a solution

using System;
using System.IO;

namespace Test1
{
    class Program
    {
        static void Main(string[] args)
        {
            // Read the data.txt textfile.
            var data = System.IO.File.ReadAllText(@"..\..\Reading.txt");

            // Create a new List of float[]
            var arrays = new List<float[]> ();

            // Split data file content into lines
            var lines = data.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);

            // Loop all lines
            foreach (var line in lines)
            {
                // Create a new List<float> representing all the commaseparated numbers in this line
                var lineArray = new List <float> ();

                // Slipt line by , and loop through all the numeric valus
                foreach (var s in line.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
                {
                    // Add converted numeric value to our lineArray 
                    lineArray.Add(Convert.ToInt64(s));
                    //lineArray.Add(Convert.ToSingle(s));
                }
                // Add lineArray to main array
                arrays.Add(lineArray.ToArray());


                // Loop repeats until there are noe more lines

                int i = 0, result = 0;
                while (i < lineArray.Count)
                {
                    result += Convert.ToInt32(lineArray[i++]);
                }

                Console.WriteLine(result);
            }

            //var numberOfRows = lines.Count();
            //var numberOfValues = arrays.Sum(s => s.Length);

            //Console.WriteLine(numberOfRows);
            //Console.WriteLine(numberOfValues);
            Console.ReadLine();

        }
    }
    
}