project thing

@echo off
title Start
color 1f
:start
echo Do you have a program account?
set /p userin1=
if '%userin1%'=='no' goto new user
if '%userin1%'=='yes' goto begin1
if '%userin1%'=='Yes' goto begin1
if '%userin1%'=='No' goto new user
else echo You did not write "yes" or "no". Please try again, by restarting the file..

:new user
title Register
cls
set /p username=Please enter your Username
set /p password=Please enter your Password
echo %username%>username.txt
echo %password%>password.txt
cls
goto begin1

:old user
goto password

:begin1
cls
title Log In
set /p userin2=<username.txt
set /p userin3=<password.txt
set /p userin4=Username:
set /p userin5=Password:
if '%userin4%'=='%userin2%' goto password
if not '%userin4%'=='%userin2%' goto begin1

:password
if '%userin5%'=='%userin3%' goto begin2
if not '%userin5%'=='%userin3%' goto begin2
if not '%userin5%'=='%userin3%' goto begin1

:begin2
cls
title Choose App
echo Welcome %userin2%
echo Currently we only have three apps. Please write:
echo [c] then enter to open Calculator
echo [g] then enter to open Guessing Game
echo [s] then enter to open Site Selector.
set /p pressed=
if %pressed%==c goto calculator
if %pressed%==g goto guessgame
if %pressed%==s goto siteselector
else echo Sorry, but this app is not yet made.

:calculator
title Batch Calculator
color 1f
cls
:top1
echo --------------------------------------------------------------
echo Welcome to Batch Calculator
echo --------------------------------------------------------------
echo NOTE: Only works on whole numbers
echo Please write a calculation, then press enter.
echo .
set /p sum=
set /a ans=%sum%
echo.
echo = %ans%
echo --------------------------------------------------------------
pause
cls
echo Previous Answer: %ans%
goto top1
cls

echo Would you like to go back to choosing apps?
echo NOTE: saying "no" will run the game again
set /p pressed=
if '%userin1%'=='no' goto calculator
if '%userin1%'=='yes' goto begin2
if '%userin1%'=='Yes' goto begin2
if '%userin1%'=='No' goto calculator


:guessgame
cls
color 0e
title Guessing Game
set /a guessnum=0
set /a answer=%RANDOM%
set variable1=surf33
echo -------------------------------------------------
echo Welcome to the Guessing Game!
echo.
echo Try and Guess my Number!
echo -------------------------------------------------
echo.
:top2
echo.
set /p guess=
echo.
: Don't worry I barely understood this part either
if %guess% GTR %answer% ECHO Lower!
if %guess% LSS %answer% ECHO Higher!
if %guess%==%answer% GOTO EQUAL
set /a guessnum=%guessnum% +1
if %guess%==%variable1% ECHO Found the backdoor hey?, the answer is: %answer%
goto top2
:equal
echo Congratulations, You guessed right!!!
echo.
echo It took you %guessnum% guesses.
echo.
pause
cls
echo Would you like to go back to choosing apps?
echo NOTE: saying no will run the game again
set /p pressed=
if '%userin1%'=='no' goto guessgame
if '%userin1%'=='yes' goto begin2
if '%userin1%'=='Yes' goto begin2
if '%userin1%'=='No' goto guessgame

:siteselector
cls
color 2f
title Site Selector
:top3
echo ***************************************************************
echo.
echo Site Selector
echo.
echo ***************************************************************
echo.
echo Key:
echo [1] Google - Search Engine
echo [2] Gmail - Email Service
echo [3] Yahoo - Search Engine/Mail Server
echo [4] Facebook - Social Networking
echo [5] Myspace - Social Networking
echo [6] BBC - News
echo [7] Weather - Weather
echo [8] WikiHow - A How-To Website
echo [9] Instructables - A How-To Website
echo [10] YouTube - Online Videos
echo [11] Answers - Online Encyclopedia
echo [12] Wikipedia - Online Encyclopedia
echo.
echo [e] Exit
echo.
echo ***************************************************************
echo Enter the number of the website which you would like to go to:
echo.
set /p udefine=
echo.
echo ***************************************************************
if %udefine%==1 start www.google.com
if %udefine%==2 start www.gmail.com
if %udefine%==3 start www.yahoo.com
if %udefine%==4 start www.facebook.com
if %udefine%==5 start www.myspace.com
if %udefine%==6 start www.bbc.co.uk
if %udefine%==7 start www.weather.com
if %udefine%==7 start www.wikihow.com
if %udefine%==9 start www.instructables.com
if %udefine%==10 start www.youtube.com
if %udefine%==11 start www.answers.com
if %udefine%==12 start www.wikipedia.com
if %udefine%==e goto exit

cls
echo ***************************************************************
echo.
echo Thank You for using Site Selector
echo.
echo ***************************************************************
echo Type [e] to exit, [b] to go back and select another site, or [c] to select a different application.
echo.
set /p udefine=
echo.
echo ***************************************************************
if %udefine%==b goto top3
if %udefine%==e goto exit
if %udefine%==c goto begin2
:exit
cls
echo ***************************************************************
echo.
echo Thank You for using Site Selector
echo.
echo ***************************************************************
pause
cls
echo Would you like to go back to choosing apps?
echo NOTE: saying no will run the game again
set /p pressed=
if '%userin1%'=='no' goto siteselector
if '%userin1%'=='yes' goto begin2
if '%userin1%'=='Yes' goto begin2
if '%userin1%'=='No' goto siteselector