SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
Test your basic knowledge |
Perl Programming
Start Test
Study First
Subject
:
it-skills
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. To include modules in perl
join(':', @array)
Variable context
use moduleName; Ex: use Roman;
command substitution
2. Returns a copy of the string as all upper case
command substitution
uc($string)
$hashName{keyName}="Value to Add"
arithmetic comparison operators
3. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
basic binding operators
each(%hash)
like functions
sort(@array)
4. < - > - == - <= - >= - !=
print(FILEHANDLE "Data to outputn");
foreach
arithmetic comparison operators
Expression Quantifiers
5. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
reverse(%hashName)
Variable context
%ENV hash array
Scalar variables
6. Returns the length of the string including escape sequences
substr($string, $startindex, $numchars)
execution block
@arrayName size
length($string)
7. The two phases of creating a PERL program _______ - Execution
chomp($string)
substr($string, $startindex, $numchars)
delete($hashName{key})
Editing
8. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
comments
hash functions
reverse(%hashName)
uc($string)
9. The three basic ________ of the open() function: > write - >> append - < read file
reverse(%hashName)
last index
access modes
chomp(@string)
10. Remove trailing newline from each element in the array
execution block
command substitution
chomp(@string)
Scalar variables
11. To write to a filehandle
%ENV hash array
unshift(@array, $newValue)
@ARGV
print(FILEHANDLE "Data to outputn");
12. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
Scalar variables
lc($string)
@entireFile=<FILEHANDLE>
string manipulation functions
13. The four types of loops in perl: while - until - for - ________
foreach
lc($string)
like functions
reverse(@array)
14. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
$line=<FILEHANDLE>
Expression character classes
size string comparison operators
split(/\s/, $string)
15. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
unshift(@array, $newValue)
substr($string, $startindex, $numchars)
each(%hash)
use moduleName; Ex: use Roman;
16. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
push(@array, $newValue)
reverse(%hashName)
Assignment
$#arrayName
17. Stores information about the current users environment. You can print this from the command line using printenv
Editing
%ENV hash array
push(@array, $newValue)
like functions
18. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
print(FILEHANDLE "Data to outputn");
sort(@array)
Variable context
basic binding operators
19. Arrays can be assigned or read in _________
@arrayName size
execution block
array functions
scalar context (Ex: $myArray[4] = 2)
20. The variable that provides the last index of an array
$hashName{keyName}="Value to Add"
chomp(@string)
size string comparison operators
$#arrayName
21. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
sort(@array)
Array variables
values(%hash)
last index
22. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
substr($string, $startindex, $numchars)
command substitution
@entireFile=<FILEHANDLE>
@arrayName size
23. _________ in perl - An associative array
Hash variables
Scalar variables
arithmetic comparison operators
unshift(@array, $newValue)
24. Returns a copy of the string with the first letter lower case
push(@array, $newValue)
comments
reverse(%hashName)
lcfirst($string)
25. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
scalar
foreach
keys(%hash)
system commands
26. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
Assignment
Expression Quantifiers
reverse(%hashName)
last index
27. Join the elements of the array seperating the elements with the ':' character
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
28. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
lc($string)
Expression character classes
Special array
comments
29. Does the hash key with "keyName" exists
use moduleName; Ex: use Roman;
exists($hashName{keyName})
last index
flow-control
30. Removes the last element from the array pop
execution block
Hash variables
(@array)
access modes
31. Sort and array alphabetically
sort(@array)
access modes
arithmetic comparison operators
Expression Quantifiers
32. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable
uc($string)
system() function
$line=<FILEHANDLE>
(@array)
33. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
Special array
size string comparison operators
system() function
sort(@array)
34. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
newline
Scalar variables
Variable context
%ENV hash array
35. scalar(@arrayName) returns the ______ of the array names
newline
keys(%hash)
@arrayName size
lc($string)
36. Split string into an array using spaces as delimeter
split(/\s/, $string)
sort(@array)
split(/\s/, $string)
join(':', @array)
37. eq - ne - lt - le - gt - ge
size string comparison operators
join(':', @array)
foreach
last index
38. Removes trailing newline
Scalar variables
lc($string)
delete($hashName{key})
chomp($string)
39. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
Array variables
@arrayName size
reverse(%hashName)
ucfirst($string)
40. Explain how to read a line from a file handle
split(/\s/, $string)
Hash variables
$hashName{keyName}="Value to Add"
$line=<FILEHANDLE>
41. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the
print(FILEHANDLE "Data to outputn");
sort(@array)
Assignment
command substitution
42. Removes the first element of the array shift
(@array)
Expression Quantifiers
reverse(@array)
like functions
43. Assignment of hash variables in perl (when oringally defining the hash)
access modes
Hash variables
each(%hash)
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
44. Reverses the elements of the array
lc($string)
@arrayName size
(@array)
reverse(@array)
45. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
substr($string, $startindex, $numchars)
interpreter
newline
print(FILEHANDLE "Data to outputn");
46. Delete the hash entry with the key given
interpreter
last index
arithmetic comparison operators
delete($hashName{key})
47. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
execution block
interpreter
comments
values(%hash)
48. Returns a copy of the string as all lower case
basic binding operators
Hash variables
lc($string)
Assignment
49. Returns all of the values of the hash as an array
exists($hashName{keyName})
command substitution
sort(@array)
values(%hash)
50. Assignment of a hash variable for a single hash element
hash functions
scalar
Hash variables
$hashName{keyName}="Value to Add"