Ignoring whitespace when adding to char array

Question

I'm doing a school exercise where the user inputs a string and the program must check if it's a palindrome. My only problem currently is that I can't get the loop to ignore whitespaces included in the input string.

Console.Write("Insert string: ");
string input = Console.ReadLine();
char[] charArray = new char[input.Length];

for (int i = 0; i < input.Length; i++)
{
    if (Char.IsWhiteSpace(input, i))
    {
        continue;
    }
    else
    {
        charArray[i] += input[i];
    }
}
string original = new string(charArray);

I've seemingly tried everything I know, but the whitespaces just get added to the array no matter what I try. Is there a simple solution for this?

what's the status of this question? if one solved it, then it should be used to be marked as solved for it. — Funk Forty Niner
– Funk Forty Niner, Commented Mar 29, 2018 at 12:58

L_Church · Accepted Answer · 2018-01-24 16:05:05Z

1

[EDIT] Ok you can try the replace method which replaces what you provide with what you want instead (space into no space)

string str = "This is a test";
str = str.Replace(" ", "");
MessageBox.Show(str);

edited Jan 24, 2018 at 16:05

answered Jan 24, 2018 at 15:57

L_Church

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4 Comments

bornfromanegg Over a year ago

I think the OP is asking about any whitespace - not just at the start and end. Palindromes ignore whitespace.

Jesse Kämäräinen Over a year ago

If I understood correctly, Trim() only trims the whitespace from the beginning and the end of the string, not any whitespace between words in that string, so sadly it doesn't help me with this one.

Diado Over a year ago

Also, strings are immutable, so you'd want to assign the return value of Trim() to something - input = input.Trim(); for instance

L_Church Over a year ago

Alright you just got a bunch of answers! Choose your poison as they say

Mihai Caracostea · Accepted Answer · 2018-01-24 16:01:54Z

0

How about using the framework and going this route:

char[] charArray = input.Replace(" ", "").ToCharArray();

answered Jan 24, 2018 at 16:01

Mihai Caracostea

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Comments

Florian · Accepted Answer · 2018-01-24 16:03:58Z

0

Maybe this could work ?

Console.Write("Insert string: ");
string input = Console.ReadLine();
char[] charArray = input.Where(character => !Char.IsWhitespace(character)).ToArray();

answered Jan 24, 2018 at 16:03

Florian

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Comments

Jared Lovin · Accepted Answer · 2018-01-24 16:21:04Z

0

When a whitespace is encountered, you never update the value at its position and so it remains a whitespace. So, write to a new array/string:

var newString = string.Empty;

for(int i = 0; i < input.Length; i++)
{
    if(!Char.IsWhiteSpace(input[i]))
    {
        newString += input[i];
    }
}

or something more like your code:

Console.Write("Insert string: ");
string input = Console.ReadLine();
char[] charArray = new char[input.Length];
var newString = string.Empty;

for (int i = 0; i < input.Length; i++)
{
    if (Char.IsWhiteSpace(input, i))
    {
        continue;
    }
    else
    {
        newString += input[i];
    }
 }
Console.WriteLine(newString);

edited Jan 24, 2018 at 16:21

answered Jan 24, 2018 at 16:04

Jared Lovin

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1 Comment

Klitos Kyriacou Over a year ago

It's better to use StringBuilder than append to a string in a loop. Otherwise, performance will suffer significantly once the string becomes large.

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