How to read characters from right side in string

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1.00/5 (2 votes)

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Hi,

how to read characters from right side in string............

Please suggest

What I have tried:

string="samplestring";
string.Substring(string.Length - 4, 4);

it gives the result, but from left side... i want to read 4 characters from right side.

Posted 12-May-16 1:33am

Baroor

Updated 12-May-16 2:20am

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Karthik_Mahalingam 12-May-16 7:50am

what is your expected output ?

3 solutions

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Karthik_Mahalingam · Answer 1 · 2016-05-12T01:55:00

Solution 3

try this

C#

string input = "samplestring";
          var str = input.Substring(input.Length - 4, 4);
          string output = "";
          for (int i = str.Length -1; i >= 0; i--)
              output += str[i].ToString();

// output will be gnir

Posted 12-May-16 1:55am

Karthik_Mahalingam

Comments

CPallini 12-May-16 9:33am

5. It looks correct, to me.

Karthik_Mahalingam 12-May-16 9:44am

Thanks CPallini

CPallini · Answer 2 · 2016-05-12T01:49:00

Solution 1

Reverse the string
Take the wanted characters from the left

See c# - Best way to reverse a string - Stack Overflow[^].

Posted 12-May-16 1:49am

CPallini

Comments

Sergey Alexandrovich Kryukov 12-May-16 8:49am

Do you mean
3. Reverse the result
? :-) :-)

I understand your joke, but not sure about other members...

—SA

CPallini 12-May-16 9:32am

It is not a joke, actually.

Sergey Alexandrovich Kryukov 12-May-16 10:41am

Really? I know it would work, of course, but not without item 3, and it would be ridiculous in terms of performance... :-)
—SA

CPallini 12-May-16 12:52pm

No, you haven't to reverse the result, because that's exactly what the OP searches for: the string read from the right, namely 'gnir'.

Sergey Alexandrovich Kryukov 12-May-16 12:57pm

I see no indication of that, but if it's really so, your solution is pretty good (perhaps extracting the substring first and then reversing it would be better, but your solution would be more elegant.)
—SA

CPallini 12-May-16 13:22pm

The hint is in (as wrong as it is...)
"string.Substring(string.Length - 4, 4);

it gives the result, but from left side..."

Sergey Alexandrovich Kryukov 12-May-16 13:31pm

Yes, this hint tells the tale. Then your solution is more than the inquirer deserved, a 5. :-)
Someone already voted 1. Too fast. Well someone automatically vote one on all my answers, no matter what. :-)
—SA

CPallini 12-May-16 15:34pm

Thank you.
Anyway, your note about performance is correct. It is a just a quick & dirty solution for a short string.

Sergey Alexandrovich Kryukov 12-May-16 17:27pm

"Quick and Elegant" would be a good characteristic. :-)
—SA

Richard MacCutchan · Answer 3 · 2016-05-12T02:20:00

Solution 4

Your sample code will not even compile, let alone run, so it is difficult to see how you manage to get any result. The correct code would be something like:

C#

string foo ="samplestring";
string bar = foo.Substring(foo.Length - 4, 4);
Console.WriteLine("Substring: {0}", bar);

Posted 12-May-16 2:20am

Richard MacCutchan