How to convert string array to int array to make calculation?

Question

I want to read the integers after the /. thats why i tried to use this code:

while ((line = file.ReadLine()) != null)
{
    string[] ip = line.Split('/');
    Console.WriteLine(ip[1]);                    
}

this code returns me this integers as string. I want to some math calculation with this numbers ,for example, multiplication. I tried this code but it doesnt work

int[] intArray = Array.ConvertAll(ip, int.Parse);

I think one of items in `ip` array cannot be parsed as integer — Sergey Berezovskiy, Feb 09 '14 at 14:02
If you try to convert ip-adresses, this wont work that simple. — CSharpie, Feb 09 '14 at 14:02
You need to split up the ip itself since it is made up from 4 Int values, seperated by a dot — CSharpie, Feb 09 '14 at 14:04
may i not convert just ip[1]. i have to convert all ip values? — Mehmet Yüce, Feb 09 '14 at 14:08

Sergey Berezovskiy · Accepted Answer · 2014-02-09T14:14:30.153

2

You are trying to convert each item of ip array to integer. At lease second item of it - "24 25 26 27" cannot be converted to single integer value. You should take this item of ip array, split it by white space and then parse each part to integer:

int[] intArray = ip[1].Split().Select(Int32.Parse).ToArray();

Or

int[] intArray = Array.ConvertAll(ip[1].Split(), Int32.Parse);

edited Feb 09 '14 at 14:14

answered Feb 09 '14 at 14:03

Sergey Berezovskiy

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im sorry its my mistake output just 24 25 26 27 – Mehmet Yüce Feb 09 '14 at 14:10
@MehmetYüce by output you mean value of `ip[1]` item? Let me make question clear - you split line by `/`. That gives you `ip` array with second item having value like `24 25 26 27` and you want to convert this second item to array of integers? – Sergey Berezovskiy Feb 09 '14 at 14:11
@MehmetYüce OK, updated code - you should just use `Split()` without parameters or `Split(' ')` – Sergey Berezovskiy Feb 09 '14 at 14:15

score 2 · Answer 2 · answered Feb 09 '14 at 14:11

If its really about IP-Adresses, this might help

class IPV4Adress
{
      public int BlockA {get; set;}
      public int BlockB {get; set;}
      public int BlockC {get; set;}
      public int BlockD {get; set;}

      public IPV4Adress(string input)
      {
           If(String.IsNullOrEmpty(input))
                throw new ArgumentException(input);

           int[] parts = input.Split(new char{',', '.'}).Select(Int32.Pase).ToArray();
           BlockA = parts[0];
           BlockB = parts[1];
           BlockC = parts[2];
           BlockD = parts[3];
      }

      public override ToString()
      {
           return String.Format("{0}.{1}.{2}.{3}",BlockA, BlockB, BlockC, BlockD);
      }        
}

Then read it from File:

IPV4Adress[] adresses = File.ReadLines(fileName).SelectMany(line=>line.Split('/')).Select(part => new IPV4Adress(part)).ToArray();

I am bored and thought, why not provide a fullblown soloution. — CSharpie, Feb 09 '14 at 14:14
ups, I didn't see the comments sorry I thought how is this related with ip adresses but apparently it is:) — Selman Genç, Feb 09 '14 at 14:21

score 0 · Answer 3 · edited May 23 '17 at 12:20

0

Given an array you can use the Array.ConvertAll method:

int[] myInts = Array.ConvertAll(arr, s => int.Parse(s));

(or)

int[] myInts = arr.Select(s => int.Parse(s)).ToArray();

(Or)

var converted = arr.Select(int.Parse)

A LINQ solution is similar, except you would need the extra ToArray call to get an array:

int[] myInts = arr.Select(int.Parse).ToArray();

Sourec

edited May 23 '17 at 12:20

Community

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answered Feb 09 '14 at 14:01

Vignesh Kumar A

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How to convert string array to int array to make calculation?

3 Answers3