Arrays - 03_TwoCharsEqual

using System;

/*
 * 3. Write a program that compares two char arrays lexicographically (letter by letter).
 */
class TwoCharsEqual
{
    static void Main()
    {
        bool equal = false;
        bool firstIsBefore = false;
        bool equalDiffSizes = true;

        Console.Write("Please enter the first char or string: ");
        string firstStr = Console.ReadLine();

        Console.Write("Please enter the second char or string: ");
        string secondStr = Console.ReadLine();

        // Used to check whether the algorithm works as the build-in function CompareTo in .NET
        // int resultCompare = firstStr.CompareTo(secondStr);
        // Console.WriteLine(resultCompare);

        char[] firstCharArray = firstStr.ToCharArray();
        char[] secondCharArray = secondStr.ToCharArray();

        int firstCharArrLength = firstCharArray.Length;
        int secondCharArrLength = secondCharArray.Length;

        int minLength = Math.Min(firstCharArrLength, secondCharArrLength);

        for (int i = 0; i < minLength; i++)
        {
            if (firstCharArray[i] == secondCharArray[i])
            {
                equalDiffSizes = true;
            }
            else
            {
                if (firstCharArray[i] < secondCharArray[i])
                {
                    firstIsBefore = true;
                }
                else
                {
                    firstIsBefore = false;
                }
            }
        }

        // If all chars are equal till the most right char of the shortest string,
        // then we compare the both string lengths and the one with less chars
        // is lexicographically before the other string.
        if (equalDiffSizes)
        {
            if (firstCharArrLength == secondCharArrLength)
            {
                equal = true;
            }
            else if (firstCharArrLength < secondCharArrLength)
            {
                firstIsBefore = true;
            }
        }

        if (equal)
        {
            Console.WriteLine("Both strings are equal.");
        }
        else if (firstIsBefore)
        {
            Console.WriteLine("The first string is lexicographically before the second one.");
        }
        else
        {
            Console.WriteLine("The second string is lexicographically before the first one.");
        }
    }
}