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Quiz for PERL Tutorial





1. When you're pattern matching, you describe the pattern using:

A string in double quotes
A MySQL select statement
A regular expression
A template

2. Perl is:

A type of interactive web page
A programming language
An application program
A relational database

3. The printf format "%6.2f" displays a number

At least six columns wide in total, with two figures after the decimal place
Exactly six digits before the decimal place, and two digits after
At least six digits before the decimal place, and two digits after
Exactly six columns wide in total, with two figures after the decimal place

4. The statement open (FH,"abc.txt");

opens the file abc.txt for overwriting
opens the file abc.txt for reading
contains an error, so won't compile
opens the file abc.txt for appending

5. When you create a variable, you may assume it starts off containing:

1
You may not make any assumption
The boolean value "false"
A null string (or 0 arithmetically)

6. Which brackets do you use to change the order of precedence of operations?

Curly braces
Square brackets
Round brackets
You don't use brackets in Perl - you write in RPN (Reverse Polish Notation)

7. Which of the following tests if the string held in $qn includes the word "perl"?

if ($qn =~ /perl/) .....
if ($qn == "perl") ....
if ($qn = "perl") .....
if ($qn eq "perl") .....

8. Which of these is NOT available for Perl:

Perl, legally, for free
Individual and site licenses
Full documentation of the language which you can print out yourself
A Carribean cruise in 2006 on which you can meet some of the Perl gurus.

9. Perl was first released in:

1978
1998
Perl hasn't yet been released
1988

10. Which of the following is NOT a comment line in a Perl program?

# This is a comment
#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/#/
##########################################################
//////////////////////////////////////////////////////////

11. What is a file handle used for?

Reading binary data from a file into a scalar variable
Finding where a file is on the disc
Accessing a disc file or other input/output stream
Deleting, moving or renaming a file

12. The "%" operator returns:

The larger of two numbers e.g. 200 % 20 would return 200
A percentage of a number e.g. 200 % 20 would return 40
The remainder when one number is divided by another
The remainder when one number is divided by another e.g. 18 % 7 would return 5

13. What is Perl?

Practical Extraction and Report Language
Practice for Exclusive and Report Language
Practical Extraction and Report Learning
Practical Exclusive and Report Language

14. Which of the following is used in perl?

else if
elseif
elsif
elif

15. The $_ variable

holds the last pattern matched.
holds the output field separator.
identifies the current command line argument.
none of the above is correct.

16. The getdir command

Reads a single file name from an open directory handle.
Reads the rest of the file names from an open directory handle.
Only works after anopendir command.
Is not a perl command.

17. The value of the expression $yards += 10

is 10.
is true.
cannot be determined from the information given.
relies on which command line arguments were used.

18. $x = @y[2 .. 4]

assigns$x the third, fourth and fifth elements of the y array concatenated together.
assigns$y[4] to $x.
assigns$y[2] to $x.
assigns 3 to$x.

19. Which of the following commands will turn a scalar ($str)into an array of characters?

@a = split($str).
@a = split(/\s/, $str).
This task can be done in Perl but none of the above commands do it.
@a = split(/./, $str).

20. <ARGV>

more than one of the above is correct.
identifies any command line arguments starting with a-.
will read the standard input if no arguments are listed on the command line.
can be used to read each line in every file name listed on the command line.



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