Initial data commit

Task/Hailstone-sequence/Batch-File/hailstone-sequence-2.bat

@@ -0,0 +1,23 @@
+@echo off
+setlocal enableDelayedExpansion
+if "%~1"=="test" (
+  for /l %%. in () do (
+    set /a "test1=num %% 2, cnt=cnt+1"
+    if !test1! equ 0 (set /a num/=2 & if !num! equ 1 exit !cnt!) else (set /a num=3*num+1)
+  )
+)
+
+set max=0
+set record=0
+
+for /l %%X in (2,1,100000) do (
+	set num=%%X & cmd /c "%~f0" test
+	if !errorlevel! gtr !max! (set /a "max=!errorlevel!,record=%%X")
+)
+set /a max+=1
+
+echo.Number less than 100000 with longest sequence: %record%
+echo.With length %max%.
+pause>nul
+
+exit /b 0