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. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
foreach
like functions
exists($hashName{keyName})
chomp($string)
2. The two phases of creating a PERL program _______ - Execution
Editing
Array variables
delete($hashName{key})
chomp(@string)
3. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
Expression character classes
flow-control
chomp($string)
scalar
4. Does the hash key with "keyName" exists
exists($hashName{keyName})
substr($string, $startindex, $numchars)
uc($string)
(@array)
5. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
flow-control
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
reverse(%hashName)
comments
6. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
scalar context (Ex: $myArray[4] = 2)
hash functions
exists($hashName{keyName})
last index
7. < - > - == - <= - >= - !=
arithmetic comparison operators
each(%hash)
execution block
use moduleName; Ex: use Roman;
8. 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
9. Stores information about the current users environment. You can print this from the command line using printenv
%ENV hash array
similar data types
array functions
(@array)
10. Assignment of hash variables in perl (when oringally defining the hash)
access modes
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
$hashName{keyName}="Value to Add"
scalar
11. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
Expression Quantifiers
Variable context
Editing
string manipulation functions
12. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
basic binding operators
substr($string, $startindex, $numchars)
scalar
exists($hashName{keyName})
13. Removes trailing newline
arithmetic comparison operators
%ENV hash array
chomp($string)
each(%hash)
14. The use of "if" "if-else" and "if-elsif-else"
Assignment
flow-control
arithmetic comparison operators
newline
15. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
ucfirst($string)
Assignment
length($string)
lcfirst($string)
16. Remove trailing newline from each element in the array
chomp(@string)
string manipulation functions
length($string)
FILEHANDLE
17. A special system variable used to pass arguments to script
@ARGV
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
foreach
lcfirst($string)
18. The three basic ________ of the open() function: > write - >> append - < read file
access modes
Array variables
like functions
sort(@array)
19. Reverses the elements of the array
reverse(@array)
flow-control
unshift(@array, $newValue)
access modes
20. scalar(@arrayName) returns the ______ of the array names
access modes
@arrayName size
hash functions
$hashName{keyName}="Value to Add"
21. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
each(%hash)
arithmetic comparison operators
Special array
(@array)
22. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
Expression Quantifiers
foreach
access modes
keys(%hash)
23. Delete the hash entry with the key given
delete($hashName{key})
scalar context (Ex: $myArray[4] = 2)
@ARGV
string manipulation functions
24. _________ in perl - An associative array
system commands
chomp(@string)
Hash variables
arithmetic comparison operators
25. Returns all of the values of the hash as an array
$#arrayName
last index
lc($string)
values(%hash)
26. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
system commands
(@array)
foreach
scalar
27. Returns a copy of the string as all upper case
Assignment
hash functions
uc($string)
lcfirst($string)
28. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
string manipulation functions
sort(@array)
exists($hashName{keyName})
execution block
29. The open() statement in perl: open(________, file_mode, "filename.txt")
sort(@array)
values(%hash)
FILEHANDLE
chomp(@string)
30. Add a new element to the from of the array with the value $newwValue
use moduleName; Ex: use Roman;
unshift(@array, $newValue)
similar data types
print(FILEHANDLE "Data to outputn");
31. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
$line=<FILEHANDLE>
hash functions
chomp($string)
length($string)
32. The variable that provides the last index of an array
chomp($string)
size string comparison operators
basic binding operators
$#arrayName
33. Removes the first element of the array shift
basic binding operators
(@array)
execution block
$hashName{keyName}="Value to Add"
34. Returns a copy of the string with the first letter lower case
basic binding operators
use moduleName; Ex: use Roman;
lcfirst($string)
hash functions
35. Arrays can be assigned or read in _________
(@array)
push(@array, $newValue)
scalar context (Ex: $myArray[4] = 2)
arithmetic comparison operators
36. The four types of loops in perl: while - until - for - ________
foreach
push(@array, $newValue)
like functions
Special array
37. Returns a copy of the string as all lower case
lc($string)
Hash variables
unshift(@array, $newValue)
use moduleName; Ex: use Roman;
38. Adds a new element to end of the array with value $newValue
keys(%hash)
join(':', @array)
lc($string)
push(@array, $newValue)
39. In arrays elements need not be __________
FILEHANDLE
similar data types
Expression character classes
Array variables
40. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
Assignment
FILEHANDLE
uc($string)
substr($string, $startindex, $numchars)
41. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
@arrayName size
Scalar variables
access modes
last index
42. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
execution block
size string comparison operators
$hashName{keyName}="Value to Add"
newline
43. Split string into an array using spaces as delimeter
split(/\s/, $string)
each(%hash)
flow-control
print(FILEHANDLE "Data to outputn");
44. To write to a filehandle
system commands
interpreter
print(FILEHANDLE "Data to outputn");
unshift(@array, $newValue)
45. _________ @arrayName) returns the size of the array
substr($string, $startindex, $numchars)
@arrayName size
newline
scalar
46. To read an entire file into an array (one line per element)
last index
sort(@array)
Special array
@entireFile=<FILEHANDLE>
47. In perl the _______ will recognize syntax errors and halt execution BEFORE it begins - and will output statements; it does not understand and the line which it encountered the error on
interpreter
scalar
reverse(%hashName)
ucfirst($string)
48. Assignment of a hash variable for a single hash element
$hashName{keyName}="Value to Add"
chomp(@string)
Hash variables
FILEHANDLE
49. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable
scalar
system commands
system() function
(@array)
50. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
arithmetic comparison operators
length($string)
join(':', @array)
string manipulation functions