perl 期末考试题

PERL复习题

一、选择题B

1. What is the simplest type of data that Perl can work with?

A element

B scalar

C vector

D component

2. Which operator can be used to take the bottom item from an array?

A pop

B push

C pull

D plant

3. Which operator is used to arrange items in character order?

A ascend

B sort

C arrange

D descend

4. Rather than using print, what is often used in Perl when formatting is important?

A printf

B format

C align

D show

5. Which modifier can be used when matching in Perl to ignore case?

A s

B v

C i

D c

6. Which operator can be used to break up a string into more than one part based upon a separator?

A chop

B split

C divide

D parse

7. What option do you use when starting Perl to tell it to run in warning mode? __________ (Fill in the blank.)

8. Which control structure can be used to execute only a condition is false?

A until

B unless

C while

D without

9. Which of the following commands should be used to open a filehandle named KAREN to an existing file named sw?

A open KAREN “>sw”;

B open KAREN, “>sw”;

C open “sw” KAREN;

D open “>sw”, KAREN;

10. Within Perl, which operator is used to change the working directory?

A cd

B chdir

C pwd

D wd

11. Which operator can be used to access the first item in an array?

A shift

B start

C right$

D left$

12. Within a loop, which operator immediately ends execution of the loop?

A next

B last

C redo

D leave

13. Which function can be used to make sure your program exits with a nonzero status even if there a standard error?

A hash

B noexit

C nozero

D die

14. Which of the following operators work most like simple searching/pattern matching?

A /f

B /g

C s///

D m//

15. Which keyword is used in Perl to define a subroutine?

A branch

B sub

C split

D make

16. You want to close the directory handle EV AN. Which of the following should you use to accomplish this?

A close EV AN;

B closedir EV AN;

C close_directory EVAN;

D none of the above

17. Which of the following lines of code accomplishes the same thing as $price = $price + 9;?

A $price +9;

B $price =+9;

C $price +=9;

D 9 + $price

18. What value do variables have before they are first assigned?