Working Calculator

@echo off
color 0A


:startup
goto input1


:preinput1
cls
echo.
echo PREVIOUS ANSWER:
echo %output%


:input1
echo.
echo Insert starting number:
echo.
set /p number1=
goto operation


:operation
echo.
echo (b) to go back
echo.
echo (a) for addition
echo (s) for subtraction
echo (m) for multiplication
echo (d) for division
echo.
set /p operationchoice=

    if %operationchoice% == a goto addinput2
    if %operationchoice% == s goto subinput2
    if %operationchoice% == m goto mulinput2
    if %operationchoice% == d goto divinput2
    if %operationchoice% == b goto input1
        goto operation



:addinput2
echo.
echo (b) to go back
echo.
echo Insert second number:
echo.
set /p number2=

    if %number2% == b goto operation

goto add


:subinput2
echo.
echo (b) to go back
echo.
echo Insert second number:
echo.
set /p number2=

    if %number2% == b goto operation

goto sub


:mulinput2
echo.
echo (b) to go back
echo.
echo Insert second number:
echo.
set /p number2=

    if %number2% == b goto operation

goto mul


:divinput2
echo.
echo (b) to go back
echo.
echo Insert second number:
echo.
set /p number2=

    if %number2% == b goto operation

goto div


:add
set /a output = %number1% + %number2%
echo.
echo ANSWER:
echo %output%
echo.
pause
goto preinput1


:sub
set /a output = %number1% - %number2%
echo.
echo ANSWER:
echo %output%
echo.
pause
goto preinput1


:mul
set /a output = %number1% * %number2%
echo.
echo ANSWER:
echo %output%
echo.
pause
goto preinput1


:div
set /a output = %number1% / %number2%
echo.
echo ANSWER:
echo %output%
echo.
pause
goto preinput1