namespace Iteration;

public class Iterations
{
    public static int Reverseint(int n)
    {
        int result = 0;
        if (n > 4)
        {
            for (int i = 0; i <= n; i++)
            {
                result = result * 10 + n % 10;
                n /= 10;
            }

            if (n == 1)
            {
                return result * 10 + n;
            }
        }
        else if (n < 4)
        {
            for (int i = 0; i >= n; i--)
            {
                result = result * 10 + n % 10;
                n /= 10;
            }

            if (n == -1)
            {
                return result * 10 + n;
            }
        }
        else
        {
            return n;
        }

    return result;
    }

    public static bool FindSub(string s, string sub)
    {
        if (sub == "")
        {
            throw new ArgumentException("sub cannot be empty");
        }
        string phrase = s;
        string[] word = s.Split(' ');
        foreach (var mot in word)
        {
            if (mot == sub)
            {
                return true;
            }
        }

        return false;
    }

    public static string FirstUpper(string s)
    {
        string phrase = s;
        string[] word = s.Split(' ');
        string result = String.Empty;
        foreach (var element in word)
        {
            string first = element.Substring(0, 1);
            result += first.ToUpper() + element.Substring(1) + " ";
        }

        return result.TrimEnd();
    }

    public static string ReplaceChar(string source, char toReplace, char replace)
    {
        string result = string.Empty;
        result = source.Replace(toReplace, replace);

        return result;
    }
}