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