@echo off

if "%1"=="/?" goto :help

setlocal

if "%1"=="" (
	goto :readEq
) else (
	goto :main
)


:readEq
	echo Type the equation, please
	rem READ

:main

set varvar=

:loop
	if "%1"=="" goto :solve
	set varvar=%varvar%%1
	shift
	goto :loop

:solve
set /a res=%varvar% 2>nul
if %errorlevel%==0 (
	echo Result = %res%
) else (
	echo Incorrect Equation
)

goto :eof

:help
echo Simple calculator
echo Type an equation and calculator will print the answer
goto :eof