c# help needed with a mix of loop terminated sentinal

[xbox221]

using System;
class stringtest2
{
    static void Main()
    {
        Console.Write("Enter something ? ");
        String line = Console.In.ReadLine();
        String list = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        String finalstring = "";
        int i = 0;
        while (line != ".")
        {
            foreach (char a in line)
            {
                if (list.IndexOf(a) != -1)
                {
                    finalstring += a.ToString();
                }
            }
            line = ".";
            Console.WriteLine("\n{0}", finalstring);
            i++;
            line = Console.In.ReadLine();
        }
    }
}

Hi, thats the code, i won't lie, i was able to get it with the precious help from some generous members of the forums ive been in (including this one). I modified it a little bit. The code work well almost like i need.

When you enter a bunch of characters, it only shows up the letters and if you add more letters, it add them to the screen. Exactly what i want. When you enter a period, it exit the loop. Thats the main goal of this code but what i'm trying to do is the period sentinal in the text you type. In other words, the loop would only exit if in the bunch of characters you enter, theres a period. In this code, it only exist the loop if you enter the perdiod alone.


Right now, thats what it does:

#@$#@a@#$23432b#$#@$@#c.

abc
.
Press any key to continue . . .


Thats what i'm trying to do:
#@$#@a@#$23432b#$#@$@#c.

abc
Press any key to continue . . .


Is it possible to make this. Ive spend hours on it but i cant find a solution.

[tabstop]

line is, as you may have guessed, the line. Your loop checks whether or not the line (not any character or anything, the line) is a period. If you want to be checking individual characters, then you need to do that when you go through all the characters (i.e. your foreach loop).

[novacain]

Opps, misread what you wanted.

Tabstop is right.

[xbox221]

I have no clue how to do this lol. The foreach loop seem to only accept a char that is declared and a letter. But thanks anyway.

[tabstop]

I have no clue how to do this lol. The foreach loop seem to only accept a char that is declared and a letter.

Well, yes, because that's the way you wrote it. It goes over every character in the line regardless of what it is, and does something to it -- specifically, checks whether or not it is in list (i.e. that big string of letters at the top). Since that's the way you wrote it, that means you can make it do something else. So you can add a check for whether a == '.', and if so what to do about it.

[itsme86]

Why not just:

while(line.IndexOf('.') == -1)

[xbox221]

Why not just:

while(line.IndexOf('.') == -1)

thanks lol i couldn't figure a way to terminate the while loop properly.