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