-----------------------------------------------------------------------
@echo off
SET startchar=%2
SET length=%3
SET string=%1
CALL SET substring=%%string:~%startchar%,%length%%%
ECHO %substring%
-----------------------------------------------------------------------
script.bat sir_de_caractere pozitie_start lungime_secventa
-----------------------------------------------------------------------
1. script.bat abcdefghijklmnopqrstuvwxyz 0 5
2. script.bat abcdefghijklmnopqrstuvwxyz -5 5
3. script.bat abcdefghijklmnopqrstuvwxyz 3 7


-----------------------------------------------------------------------
@echo off
SET subsir=%2
SET string=%1
CALL SET substring=%%string:%subsir%=%%
ECHO %substring%
-----------------------------------------------------------------------
script.bat sir_de_caractere subsir_de_eliminat
-----------------------------------------------------------------------
4. script.bat abcdefghijklmnopqrstuvwxyz klmnop


-----------------------------------------------------------------------
@echo off
SET subsir=%2
SET string=%1
SET newsir=%3
CALL SET substring=%%string:%subsir%=%newsir%%%
ECHO %substring%
-----------------------------------------------------------------------
script.bat sir_de_caractere subsir_vechi subsir_nou
-----------------------------------------------------------------------
5. script.bat abcdefghijklmnopqrstuvwxyz klmnop 12345678910


-----------------------------------------------------------------------
@echo off
SET startchar=%2
SET endchar=%3
SET string=%1
CALL SET substring=%%string:~%startchar%,%endchar%%%
ECHO %substring%
-----------------------------------------------------------------------
script.bat sir_de_caractere pozitie_start pozitie_stop
-----------------------------------------------------------------------
6. script.bat abcdefghijklmnopqrstuvwxyz 1 -1


-----------------------------------------------------------------------
@echo off
SET startchar=%2
SET endchar=-%2
SET string=%1
CALL SET substring=%%string:~%startchar%,%endchar%%%
ECHO %substring%
-----------------------------------------------------------------------
script.bat sir_de_caractere lungime
-----------------------------------------------------------------------
7. script.bat "abc def ghijklmnopqrstuvwxyz"
SET string=%~1
CALL SET substring=%%string: =%%%
ECHO %substring%

-----------------------------------------------------------------------
@echo off
set list=1 2 3 4
(for %%a in (%list%) do (
echo %%a
))
-----------------------------------------------------------------------
script.bat
-----------------------------------------------------------------------
8. script.bat


-----------------------------------------------------------------------
@echo off
set /A a=%1
set /A b=%2
if %a% lss %b% (echo "a=%a% este mai mic decat b=%b%") else (echo "a=%a% este mai mare decat b=%b%")
-----------------------------------------------------------------------
9. script.bat 15 9

-----------------------------------------------------------------------
@echo off
set /A a=%1
set /A b=%2
set /A c=%3
set /A r1=%a%*%c%*%c%+%b%
set /A r3=5*%c%-7
if %c% lss 0 (echo "E(%c%)=%r1%") else (if %c% == 0 (echo "E(%c%)=2") else (echo "E(%c%)=%r3%"))
-----------------------------------------------------------------------
10. 
script.bat 1 2 -3
script.bat 1 2 3
script.bat 1 2 0

-----------------------------------------------------------------------
11. a) script.bat 10 20 30 40 50
-----------------------------------------------------------------------
@ECHO OFF
SET /A suma=0
:Loop
IF "%1"=="" GOTO completed
FOR %%F IN (%1) DO (
	IF %1 GTR 0 (
		SET /A suma=%suma%+%1
	)
)
SHIFT
GOTO Loop
:completed
echo %suma%
-----------------------------------------------------------------------
11. b) script.bat 10 20 30 40 50
-----------------------------------------------------------------------
@echo off
SET /A prod=1
:start
SET /A numar = %1
SET /A divnumber = %numar% / 2 
SET /A prodnumber = %divnumber% * 2
IF %numar% EQU %prodnumber% (goto :odd) ELSE (goto :even)
:odd
	SET /A prod=%prod% * %numar%
:even
if "%~2" NEQ "" (
    shift
    goto :start
)
echo %prod%
-----------------------------------------------------------------------
11. b) - varianta de rezolvare 2
@echo off
setlocal enabledelayedexpansion

set /a prod=1
for %%a in (%*) do (
	echo nr=%%a
	set /a rest=%%a %% 2
	echo rest=!rest!
	if !rest! EQU 0 set /a prod=!prod! * %%a
	echo prod=!prod!
)
-----------------------------------------------------------------------
11. c) script.bat -10 -20 -30 -40 -50
-----------------------------------------------------------------------
@echo off
SET /A suma = 0
SET /A pozitie = 1
:start
SET /A numar = %1
SET /A divnumber = %pozitie% / 2 
SET /A prodnumber = %divnumber% * 2
IF %pozitie% NEQ %prodnumber% (IF %numar% LSS 0 (goto :odd) ELSE goto :even) ELSE (goto :even)
:odd
	SET /A suma=%suma% + %numar%
:even
SET /A pozitie = %pozitie% +1
if "%~2" NEQ "" (
    shift
    goto :start
)
echo %suma%
-----------------------------------------------------------------------
11. c) - varianta de rezolvare 2
@echo off
SET /A suma = 0
SET /A pozitie = 1
:start
SET /A numar = %1

IF %numar% LSS 0 (goto :odd) ELSE goto :even
:odd
	SET /A suma=%suma% + %numar%
:even
SET /A pozitie = %pozitie% + 2
if "%~2" NEQ "" (
if "%~3" NEQ "" (
    shift
    shift
    goto :start
)
)
echo %suma%
-----------------------------------------------------------------------
@echo off
setlocal enabledelayedexpansion
SET /A suma = 0
SET /A pozitie = 1
for %%a in (%*) do (
	echo nr=%%a
	set /a rest = %pozitie% %% 2
	echo rest=!rest!
	if !rest! EQU 1 (
		IF %%a LSS 0 ( set /a suma=!suma!+%%a)
	)
)

echo suma=%suma%
-----------------------------------------------------------------------
11. d) script.bat 6 7 17 9 12
-----------------------------------------------------------------------
@echo off
SET /A suma = 0
SET /A pozitie = 0
:start
SET /A numar = %1
SET /A divnumber = %numar% / 5 
SET /A prodnumber = %divnumber% * 5
SET /A rest = %numar% - %prodnumber%
IF %rest% EQU 2 (
	SET /A suma=%suma% + %numar%
	SET /A pozitie = %pozitie% +1
)

if "%~2" NEQ "" (
    shift
    goto :start
)
SET /A media = %suma% / %pozitie%
echo %media%
-----------------------------------------------------------------------
11. c) varianta de rezolvare 2
@echo off
SET /A suma = 0
SET /A pozitie = 0
:start
if [%1] == [] goto :final
SET /A numar = %1
SET /A divnumber = %numar% / 5 
SET /A prodnumber = %divnumber% * 5
SET /A rest = %numar% - %prodnumber%
IF %rest% EQU 2 (
	SET /A suma=%suma% + %numar%
	SET /A pozitie = %pozitie% +1
)
shift
goto :start
:final
SET /A media = %suma% / %pozitie%
echo %media%

-----------------------------------------------------------------------
11 c) varianta de rezolvare 3
@echo off
SET /A suma = 0
SET /A pozitie = 0
:start
if [%1] == [] goto :final
SET /A numar = %1
SET /A rest = %numar% %% 5
IF %rest% EQU 2 (
	SET /A suma=%suma% + %numar%
	SET /A pozitie = %pozitie% +1
)
shift
goto :start
:final
SET /A media = %suma% / %pozitie%
echo %media%
-----------------------------------------------------------------------
11. c) varianta de rezolvare 4
@echo off
setlocal enabledelayedexpansion
SET /A suma = 0
SET /A numere = 0

for %%a in (%*) do (
	set /a rest = %%a %% 5
	if !rest! EQU 2 (
	set /a suma = !suma! + %%a	
	set /a numere = !numere! + 1
	)
)

if %numere% EQU 0 (echo Media nu se calculeaza) else (
set /a media = %suma% / %numere%
echo %media%
)

-----------------------------------------------------------------------
11. e) script.bat 6 7 17 9 1 2
-----------------------------------------------------------------------
@echo off
SET /A suma = 0
SET /A pozitie = 0
:start
SET /A numar = %1
IF %numar% LSS 6 (
	SET /A pozitie = %pozitie% +1
)

if "%~2" NEQ "" (
    shift
    goto :start
)
echo %pozitie%
-----------------------------------------------------------------------
11. f) script.bat 4 10 20 30 40 50 60
-----------------------------------------------------------------------
@echo off
SET /A p=%1
SHIFT
SET /A suma = 0
SET /A pozitie = 1
:start
IF %pozitie% LSS %p% (
	SET /A pozitie = %pozitie% +1
) ELSE (goto :checkNumber)
if "%~2" NEQ "" (
    shift
    goto :start
)
:checkNumber
SET /A numar = %1
SET /A divnumber = %numar% / 4 
SET /A prodnumber = %divnumber% * 4
SET /A rest = %numar% - %prodnumber%
IF %rest% EQU 0 (ECHO E divizibil!) ELSE (ECHO Nu e divizibil!)
-----------------------------------------------------------------------
11 f) varianta de rezolvare 2
@echo off
setlocal enabledelayedexpansion
SET /A p=%1
SHIFT
SET /A pozitie = 0

for %%a in (%*) do (
  if !pozitie! NEQ 0 (
    echo Elem %%a se afla pe pozitia !pozitie!
  )
  if !pozitie! EQU %p% (
	set /a rest = %%a %% 4
	if !rest! EQU 0 (echo "Divizibil") else (echo "Nu e divizibil")
  )
  set /a pozitie=!pozitie!+1
)
-----------------------------------------------------------------------
11 f) varianta de rezolvare 3
@echo off
setlocal enabledelayedexpansion
SET /p p=p:
SET /p n=n:

for /L %%a in (1,1,%n%) do (
  set /p x=nr[%%a]:
  if %%a EQU %p% (
    set /a rest = !x! %% 4
    if !rest! EQU 0 (echo "divizibil") else (echo "nu e divizibil")
    goto :eof
  )
)