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