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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. eq - ne - lt - le - gt - ge
Array variables
scalar context (Ex: $myArray[4] = 2)
%ENV hash array
size string comparison operators
2. Stores information about the current users environment. You can print this from the command line using printenv
%ENV hash array
lc($string)
lcfirst($string)
(@array)
3. 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
4. Returns a copy of the string as all upper case
scalar context (Ex: $myArray[4] = 2)
uc($string)
like functions
system commands
5. Does the hash key with "keyName" exists
reverse(%hashName)
exists($hashName{keyName})
unshift(@array, $newValue)
push(@array, $newValue)
6. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
chomp(@string)
Variable context
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
FILEHANDLE
7. The two phases of creating a PERL program _______ - Execution
Editing
@entireFile=<FILEHANDLE>
comments
%ENV hash array
8. To include modules in perl
use moduleName; Ex: use Roman;
system() function
ucfirst($string)
Expression character classes
9. 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
Expression Quantifiers
system() function
%ENV hash array
split(/\s/, $string)
10. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the
each(%hash)
chomp($string)
keys(%hash)
command substitution
11. Removes the last element from the array pop
(@array)
$#arrayName
print(FILEHANDLE "Data to outputn");
reverse(@array)
12. Returns all of the values of the hash as an array
values(%hash)
reverse(@array)
foreach
array functions
13. scalar(@arrayName) returns the ______ of the array names
size string comparison operators
access modes
$hashName{keyName}="Value to Add"
@arrayName size
14. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
array functions
split(/\s/, $string)
lc($string)
last index
15. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
join(':', @array)
use moduleName; Ex: use Roman;
lcfirst($string)
Expression character classes
16. Returns all of the keys of the hash as an array
scalar
keys(%hash)
arithmetic comparison operators
access modes
17. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
FILEHANDLE
substr($string, $startindex, $numchars)
@arrayName size
Special array
18. Removes trailing newline
size string comparison operators
lc($string)
%ENV hash array
chomp($string)
19. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
interpreter
@ARGV
execution block
lcfirst($string)
20. Add a new element to the from of the array with the value $newwValue
chomp($string)
flow-control
unshift(@array, $newValue)
substr($string, $startindex, $numchars)
21. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
reverse(@array)
basic binding operators
values(%hash)
reverse(%hashName)
22. Sort and array alphabetically
Expression Quantifiers
sort(@array)
exists($hashName{keyName})
push(@array, $newValue)
23. Arrays can be assigned or read in _________
sort(@array)
@ARGV
scalar context (Ex: $myArray[4] = 2)
last index
24. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
keys(%hash)
uc($string)
hash functions
newline
25. To write to a filehandle
delete($hashName{key})
print(FILEHANDLE "Data to outputn");
(@array)
newline
26. The open() statement in perl: open(________, file_mode, "filename.txt")
@arrayName size
FILEHANDLE
flow-control
Scalar variables
27. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
Variable context
%ENV hash array
substr($string, $startindex, $numchars)
(@array)
28. < - > - == - <= - >= - !=
arithmetic comparison operators
chomp($string)
ucfirst($string)
size string comparison operators
29. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
system commands
$#arrayName
Expression character classes
hash functions
30. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
Scalar variables
basic binding operators
command substitution
@entireFile=<FILEHANDLE>
31. Removes the first element of the array shift
interpreter
(@array)
scalar context (Ex: $myArray[4] = 2)
Expression character classes
32. Explain how to read a line from a file handle
array functions
uc($string)
values(%hash)
$line=<FILEHANDLE>
33. The four types of loops in perl: while - until - for - ________
substr($string, $startindex, $numchars)
Expression character classes
foreach
Scalar variables
34. Returns a copy of the string with the first letter upper case
ucfirst($string)
interpreter
exists($hashName{keyName})
$#arrayName
35. To read an entire file into an array (one line per element)
reverse(%hashName)
@entireFile=<FILEHANDLE>
lc($string)
split(/\s/, $string)
36. Split string into an array using spaces as delimeter
Array variables
last index
newline
split(/\s/, $string)
37. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
FILEHANDLE
sort(@array)
string manipulation functions
Variable context
38. In arrays elements need not be __________
push(@array, $newValue)
comments
values(%hash)
similar data types
39. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
Scalar variables
Variable context
basic binding operators
lc($string)
40. Adds a new element to end of the array with value $newValue
use moduleName; Ex: use Roman;
push(@array, $newValue)
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
lcfirst($string)
41. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
$hashName{keyName}="Value to Add"
(@array)
uc($string)
hash functions
42. The use of "if" "if-else" and "if-elsif-else"
flow-control
like functions
last index
Variable context
43. The three basic ________ of the open() function: > write - >> append - < read file
push(@array, $newValue)
substr($string, $startindex, $numchars)
Expression Quantifiers
access modes
44. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
length($string)
%ENV hash array
push(@array, $newValue)
Array variables
45. The variable that provides the last index of an array
size string comparison operators
flow-control
length($string)
$#arrayName
46. Returns the length of the string including escape sequences
comments
values(%hash)
use moduleName; Ex: use Roman;
length($string)
47. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
Assignment
scalar
length($string)
Editing
48. _________ in perl - An associative array
command substitution
system() function
Assignment
Hash variables
49. Assignment of a hash variable for a single hash element
@ARGV
last index
$hashName{keyName}="Value to Add"
%ENV hash array
50. Returns a copy of the string with the first letter lower case
each(%hash)
@arrayName size
access modes
lcfirst($string)