using System;

public class Test
{
    static int GetWordCount(string text)
    {
        int wordCount = 0, index = 0;

        // skip whitespace until first word
        while (index < text.Length && char.IsWhiteSpace(text[index]))
            index++;

        while (index < text.Length)
        {
            // check if current char is part of a word
            while (index < text.Length && !char.IsWhiteSpace(text[index]))
                index++;

            wordCount++;

            // skip whitespace until next word
            while (index < text.Length && char.IsWhiteSpace(text[index]))
                index++;
        }

        return wordCount;
    }

    private static void AssertWordCount(int expectedCount, string input)
    {
        var actual = GetWordCount(input);
        if (actual != expectedCount)
            throw new Exception(string.Format("Input '{0}': expected {1}, but got {2}",
                input, expectedCount, actual));
    }

    public static void Main()
    {
        foreach (var test in new[] { "", " ", "   " })
        {
            AssertWordCount(0, test);
        }

        foreach (var test in new[] { "test", " test", "test ", " test " })
        {
            AssertWordCount(1, test);
        }

        foreach (var test in new[] { "a b", " a b", "a b ", " a b " })
        {
            AssertWordCount(2, test);
        }

        Console.WriteLine("Passed without exceptions");
    }
}