Average Word Length problem C# test 3 and 5 fail

Question

I think it have connection with rounding. When i use Math.Round i get 2 fails (test 3 and 5) but when use Math.Ceiling i have only one fail (in test 1)
My code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
string sentence = Console.ReadLine();
List<char> word = new List<char>();
List<int> sum = new List<int>();
int i = 0;

double result;

while(i <= sentence.Length-1)
{
if (sentence[i].Equals(' ') || sentence.Equals(',') || sentence.Equals('.'))
{

sum.Add(word.Count);

word.Clear();

i++;
}
else
{
word.Add(sentence[i]);

i++;
}

}
sum.Add(word.Count);
result = Math.Round(sum.Average());
Console.WriteLine(result);

//Console.ReadLine();
}
}
}

Answer 1

In this code coach the output should be the nearest integer greater than or equal to the average.
Just change Math.round() to Math.ceil()

Answer 2

Davide if i use Math.Ceiling (only this metode is in C#) i have fail in first test, correct answer is 3 and my code gives 4.
The average in first case is 3,80 so Math.Ceiling it rounds well to 4 but SoloLearn considers this fail :/

Answer 3

Unfortunately I can't debug your program because I don't know C#, but I think that the problem is that you are counting spaces as parts of words.

Answer 4

I checked the issue of space on start because i have list with length of each word and thise numbers are correct (no space, ",", "." ) :/