diff --git a/LogInSystem.cpp b/LogInSystem.cpp
new file mode 100644
index 0000000..367093e
--- /dev/null
+++ b/LogInSystem.cpp
@@ -0,0 +1,285 @@
+/*
+ *	Written by   : Lee Bin Hong
+ *	Last edited  : 4/12/2016
+ */
+
+#include <iostream>
+#include <string>
+#include <fstream>
+using namespace std;
+
+int getUsernameCounter(string, int);
+void login();
+void loggedIn();
+void registration();
+void editCredentials();
+void chgUsername();
+void chgPassword();
+void chgEmail();
+void chgPhoneNo();
+void quit();
+
+const int size = 10000;
+string username[size];
+string password[size];
+string email[size];
+string phoneNo[size];
+int counter;
+int x = 0;
+int wrongPass = 0;
+
+int main()
+{
+	ifstream fin("database.txt");
+	int choice;
+
+	while (!fin.eof())
+	{
+		fin >> username[x] >> password[x] >> email[x] >> phoneNo[x];
+		x++;
+	}
+
+	cout << "Please choose one of the following options :" << endl;
+	cout << "Log In       - 1" << endl;
+	cout << "Registration - 2" << endl;
+	cout << "Exit         - 0" << endl;
+
+	cin >> choice;
+	switch (choice)
+	{
+	case 1:
+		login();
+		break;
+	case 2:
+		registration();
+		break;
+	case 0:
+		break;
+	}
+
+	ofstream fout("database.txt");
+
+	for (int i = 0; i <= x; i++)
+	{
+		fout << username[i] << " " << password[i] << " " << email[i] << " " << phoneNo[i] << " " << endl;
+	}
+  return 0;
+}
+
+int getUsernameCounter(string query, int size)
+{
+	for (int i = 0; i < size; i++)
+	{
+		if (query == username[i]) return i;
+	}
+	return -1;
+}
+
+void login()
+{
+	if (wrongPass >= 3)
+	{
+		cout << "Too much failed login attempt. The program will now be terminated." << endl;
+		quit();
+	}
+
+	string usrnme, pswd;
+	cout << "Username:";
+	cin >> usrnme;
+
+	counter = getUsernameCounter(usrnme, x);
+
+	cout << "Password:";
+	cin >> pswd;
+
+	if (pswd != password[counter])
+	{
+		cout << "Invalid username or password. Please try again.";
+		wrongPass++;
+		login();
+	}
+
+	loggedIn();
+}
+
+void registration()
+{
+	string usrnme;
+	string pswd = "2";
+	string pswd2 = "3";
+	bool available = false;
+
+	while (available == false)
+	{
+		available = true;
+
+		cout << "Username : ";
+		cin >> usrnme;
+
+		for (int i = 0; i < x; i++)
+		{
+			if (username[i] == usrnme)
+			{
+				cout << "Username unavailable. Please try again." << endl;
+				available = false;
+			}
+		}
+	}
+
+	cout << "Username is available." << endl;
+	username[x] = usrnme;
+
+	while (pswd != pswd2)
+	{
+		cout << "Password : ";
+		cin >> pswd;
+
+		cout << "Confirm password :";
+		cin >> pswd2;
+
+		if (pswd != pswd2)
+			cout << "Password unmatched. Please try again.";
+	}
+
+	password[x] = pswd;
+
+	cout << "Email : ";
+	cin >> email[x];
+
+	cout << "Phone No. : ";
+	cin >> phoneNo[x];
+
+	cout << "Account is successfully registered." << endl;
+
+	counter = x;
+
+	x++;
+
+	loggedIn();
+}
+
+void loggedIn()
+{
+	int choice;
+
+	cout << "Please choose one of the following option :" << endl;
+	cout << "View credentials - 1" << endl;
+	cout << "Edit credentials - 2" << endl;
+	cout << "Exit             - 0" << endl;
+	cin >> choice;
+
+	switch (choice)
+	{
+	case 1:
+		cout << "Username : " << username[counter] << "\nEmail : " << email[counter] << "\nPhone No. : " << phoneNo[counter] << endl;
+		loggedIn();
+		break;
+	case 2:
+		editCredentials();
+		loggedIn();
+		break;
+	case 0:
+		quit();
+	}
+
+}
+
+void editCredentials()
+{
+	int choice;
+
+	cout << "Which of the following to edit?" << endl;
+	cout << "Username  - 1" << endl;
+	cout << "Password  - 2" << endl;
+	cout << "Email     - 3" << endl;
+	cout << "Phone No. - 4" << endl;
+	cout << "Exit      - 0" << endl;
+
+	cin >> choice;
+
+	switch (choice)
+	{
+	case 1:
+		chgUsername();
+		break;
+	case 2:
+		chgPassword();
+		break;
+	case 3:
+		chgEmail();
+		break;
+	case 4:
+		chgPhoneNo();
+		break;
+	}
+}
+
+void chgUsername()
+{
+	bool available = false;
+	string usrnme;
+
+	while (available == false)
+	{
+		available = true;
+
+		cout << "Username : ";
+		cin >> usrnme;
+
+		for (int i = 0; i < x; i++)
+		{
+			if (username[i] == usrnme)
+			{
+				cout << "Username unavailable. Please try again." << endl;
+				available = false;
+			}
+		}
+	}
+
+	username[counter] = usrnme;
+
+	loggedIn();
+}
+
+void chgPassword()
+{
+	string pass;
+
+	cout << "Please input the current password : ";
+	cin >> pass;
+
+	if (pass != password[counter])
+	{
+		cout << "Wrong password. Please try again.";
+		wrongPass++;
+		chgPassword();
+	}
+}
+
+void chgEmail()
+{
+	cout << "Please input the new email : ";
+	cin >> email[counter];
+
+	loggedIn();
+}
+
+void chgPhoneNo()
+{
+	cout << "Please input the new phone no. : ";
+	cin >> phoneNo[counter];
+
+	loggedIn();
+}
+
+void quit()
+{
+	ofstream fout("database.txt");
+
+	for (int i = 0; i <= x; i++)
+	{
+		fout << username[i] << " " << password[i] << " " << email[i] << " " << phoneNo[i] << " " << endl;
+	}
+
+	exit (EXIT_SUCCESS);
+}
diff --git a/database.txt b/database.txt
new file mode 100644
index 0000000..6a9adce
--- /dev/null
+++ b/database.txt
@@ -0,0 +1,3 @@
+binhonglee bhlee03655 binhonglee@hotmail.com +13479618886 
+    
+