(Batch) question batch file with default answer

question.bat

@echo off

setlocal
:QUESTION
set answer=
set /p answer="Will you execute it? ([y]/n)  : %answer%"
if "%answer%"=="" ( 
  echo "default start"
) else if "%answer%"=="y" (
  echo "start"
) else if "%answer%"=="n" (
  echo "cancel"
  exit /b 1
)else (
  echo "other key"
  goto QUESTION
)
endlocal