Reverse Array A-Z C#

Question

How do you reverse the list in order to display A-Z in reverse from "ZYX....A" I tried to create the ReverseAlpha method but I'm not sure what to do from there.

static void Main(string[] args) {
    //variable declarations
    const int SIZE = 26;
    char[]
    alpha = new char[SIZE];
    //function calls
    FillAlpha(alpha);
    Console.WriteLine("Print Original List A-Z:");
    PrintAlpha(alpha);
    ReverseAlpha(alpha);
    Console.WriteLine("\nPrint Reversed List Z-A:");
    PrintAlpha(alpha);
    Console.Write("\n\nPress any key to continue:");
    Console.ReadKey();
}

static void FillAlpha(char[] letters) {
    for (int i = 0; i < 26; i++) {
        letters[i] = (char)(i + 65);
    }
}

static void PrintAlpha(char[] letters) {
    foreach(char c in letters)
    Console.Write(c + " ");
    Console.WriteLine();
}

static void ReverseAlpha(char[] letters) {
    char a, b, temp;
    temp = a;
    a = b;
    b = temp:
}

Imagine you have 10 boxes in a row in front of you. How would you reorder the contents of those boxes so that it was in reverse order after you complete? — zerkms
– zerkms, Commented Dec 14, 2017 at 1:33
Your ReverseAlpha function doesn't do anything. You should try harder. — Mark Benningfield
– Mark Benningfield, Commented Dec 14, 2017 at 1:40
More importantly, your ReverseAlpha method doesn't even compile. Make sure your code actually compiles first. — Kirk Woll
– Kirk Woll, Commented Dec 14, 2017 at 2:12
Possible duplicate of Reverse an array without using Array.Reverse() — littlerufe
– littlerufe, Commented Dec 14, 2017 at 2:52
It would probably be better to give your methods more meaningful names. You have a variable named alpha, which happens to be a char array, but your methods will work on any array so consider leaving Alpha out of the method names, and instead do something like static void FillArray(char[] input, int size) — littlerufe
– littlerufe, Commented Dec 14, 2017 at 2:55

Ray Krungkaew · Accepted Answer · 2017-12-14 02:59:17Z

1

https://msdn.microsoft.com/en-us/library/d3877932(v=vs.110).aspx

    static char[] ReverseAlpha(char[] letters)
    {
        letters = letters.Reverse().ToArray(); 
        return letters;
    }

edited Dec 14, 2017 at 2:59

answered Dec 14, 2017 at 2:31

Ray Krungkaew

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3 Comments

Preston Guillot Over a year ago

meta.stackoverflow.com/questions/334822/…

Sean B Over a year ago

You reference array.Reverse(), but your code is using System.Linq

littlerufe Over a year ago

actually, I was wrong - calling letters.Reverse(); does reverse the original array. Sorry!

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