Function to check if a text is alphabetical

Create a C# program that implements a function called IsAlphabetic that receives a text parameter from the user and check if the text has alphabetic characters from 'a' to 'z' including upper and lower case letters.

Input

Hello

Output

True

Solution

using System;
public class CheckTextAlphabetical
{
    public static void Main(string[] args)
    {
        string text = Console.ReadLine();
        Console.WriteLine(IsAlphabetical(text));
    }

    public static bool IsAlphabetical(string text)
    {
        text = text.ToUpper();

        for (int i = 0; i < text.Length; i++)
        {
            if (text[i] < 'A' || text[i] > 'Z')
            {
                return false;
            }
        }

        return true;
    }
}