I cannot get my subtring to work

[sharkbowman]

#include <iostream>
#include <fstream>
#include <iomanip> 
#include <string>
using namespace std;
bool validation (char c) 
{
    bool result = false;
    if (c >='A' && c <= 'Z' || c >= 'a' && c <= 'z'|| c >= '0' && c <='9' ||c =='.'||c =='-' || c =='+') result = true;
return result;
}

int main () {
    //bool ValidEmailCharacters;
	string email;
	//string anEmail;
	int s = 0;
	int e = 0;
	int i;
    int symbol = -1;
	
	string fileName; 
	string defaultfile = "fileContainingEmails.txt";
	ifstream fin;
	ofstream fout;
	cout << "Enter your file  (ENTER for Default): " ;
	getline (cin, fileName);
	
	if (fileName.length() < 2) {
	    fileName = defaultfile;
	}

	fin.open (fileName);
    // if (!fin.good()) break;
	
	fout.open ("copyPasteMyEmail.txt");
	
	//string* email[i] = new string [newemail];     //Pulls out email from txt file
	while (!fin.eof())    //reads until end of file
	{
	fin >> email;
	
	if (!fin.good()) break;
	
	cout << "Test" << endl;
	for (i = 0; i < email.length(); i++)
		if (email[i] == '@')
		symbol = i;
		{
		cout << "Test1" << endl;
			for( s = symbol; s < email.length(); s--)
			{    
			cout << "Test2" << endl;
				if (s < 0) break;
				if (validation(email[s]) == false) break;
			}
			bool Dot = false;
				for (e = symbol; e < email.length(); e++)
				{
				cout << "test3" << endl;
					if (e == email.length()) break;
					if (validation(email[e]) == false) break;
					if (email[e] == '.') Dot = true;
				}
				cout << "Test4" << endl;
			string anEmail = email.substr (s, e-s);
			cout << anEmail << endl;
			
		}
    }
	
	//fout << anEmail << endl;
   
	return 0 ;
	
}
		

[e-mail]     [e-mail]
[e-mail]
[e-mail]
[e-mail]
@@@@cjdk;lafjdsf
fasfasdf@@fadjklf.gmail.com

thers the input file if you need it

[o3hC5Di1]

Is this a duplicate of http://cplusplus.com/forum/beginner/75724/ ?

As it concerns the same code (more or less) - I'm going to assume that it is.
If not please elaborate on the problem specific to this post.

All the best,
NwN