How to reverse a string 2character and 2character from the end C#

Question

1.00/5 (1 vote)

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sample string: A3148579
i tried this code:

What I have tried:

C#

public static string Reverse(string s)
    {
        char[] charArray = s.ToCharArray();
        Array.Reverse(charArray);
        return new string(charArray);
    }

the result is 9758413A
but i want 798514A3
for understand
thanks everyone

Posted 26-Jul-20 6:07am

Member 10871138

Updated 26-Jul-20 6:21am

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OriginalGriff · Accepted Answer · 2020-07-26T06:21:00

Solution 1

What you are talking about is pretty much "swapping byte values" in effect.
Try this:

C#

private static string Reverse(string str)
    {
    StringBuilder sb = new StringBuilder(str.Length);
    for (int i = str.Length; i > 0; i -= 2)
        {
        sb.Append(str[i - 2]);
        sb.Append(str[i - 1]);
        }
    return sb.ToString();
    }

Posted 26-Jul-20 6:21am

OriginalGriff

v2

Comments

BillWoodruff 27-Jul-20 0:28am

+5 Two calls to 'Append to avoid use of 'Substring creating new strings !