Ето какво успях да измисля днеска докато бях на лекцията. Задачата работи идеално, но е доста обемиста. Ако някой може да даде съвет, чрез който да съкратя малко кода ще съм му много благодарен

using System;
class NumberАsWords
{
static void Main()
{
int number = int.Parse(Console.ReadLine());
int firstDigit = number / 100; //extract first digit
int secondDigit = number / 10 % 10; //extract second digit
int thirdDigit = number % 100 % 10; //extract third digit
if (number == 0)
{ Console.WriteLine("zero"); }

if (number % 100 == 0)
{
switch (firstDigit)
{
case 1: Console.Write("One hundred "); break;
case 2: Console.Write("Two hundred "); break;
case 3: Console.Write("Three hundred "); break;
case 4: Console.Write("Four hundred "); break;
case 5: Console.Write("Five hundred "); break;
case 6: Console.Write("Six hundred "); break;
case 7: Console.Write("Seven hundred "); break;
case 8: Console.Write("Eight hundred "); break;
case 9: Console.Write("Nine hundred "); break;
}
}

else
{
switch (firstDigit)
{
case 1: Console.Write("One hundred and "); break;
case 2: Console.Write("Two hundred and "); break;
case 3: Console.Write("Three hundred and "); break;
case 4: Console.Write("Four hundred and "); break;
case 5: Console.Write("Five hundred and "); break;
case 6: Console.Write("Six hundred and "); break;
case 7: Console.Write("Seven hundred and "); break;
case 8: Console.Write("Eight hundred and "); break;
case 9: Console.Write("Nine hundred and "); break;
}

switch (secondDigit)
{
case 1:
{
switch (thirdDigit)
{
case 1: Console.Write("eleven "); break;
case 2: Console.Write("twelve "); break;
case 3: Console.Write("thirteen "); break;
case 4: Console.Write("fourteen "); break;
case 5: Console.Write("fifteen "); break;
case 6: Console.Write("sixteen "); break;
case 7: Console.Write("seventeen "); break;
case 8: Console.Write("eighteen "); break;
case 9: Console.Write("nineteen "); break;
default: Console.WriteLine("ten"); break;
}
} break;
case 2: Console.Write("twenty "); break;
case 3: Console.Write("thirty "); break;
case 4: Console.Write("forty "); break;
case 5: Console.Write("fifty "); break;
case 6: Console.Write("sixty "); break;
case 7: Console.Write("seventy "); break;
case 8: Console.Write("eighty "); break;
case 9: Console.Write("ninety "); break;
default: Console.WriteLine(); break;
}

switch (thirdDigit)
{
case 1: Console.Write("one "); break;
case 2: Console.Write("two "); break;
case 3: Console.Write("three "); break;
case 4: Console.Write("four "); break;
case 5: Console.Write("five "); break;
case 6: Console.Write("six "); break;
case 7: Console.Write("seven "); break;
case 8: Console.Write("eight "); break;
case 9: Console.Write("nine "); break;
}
}
}
}