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