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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. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
reverse(@array)
scalar
split(/\s/, $string)
Expression Quantifiers
2. Does the hash key with "keyName" exists
use moduleName; Ex: use Roman;
%ENV hash array
exists($hashName{keyName})
Expression character classes
3. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
sort(@array)
each(%hash)
ucfirst($string)
lc($string)
4. The four types of loops in perl: while - until - for - ________
foreach
scalar
Scalar variables
(@array)
5. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
Hash variables
last index
@entireFile=<FILEHANDLE>
array functions
6. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
(@array)
system() function
Array variables
reverse(@array)
7. Split string into an array using spaces as delimeter
split(/\s/, $string)
chomp($string)
exists($hashName{keyName})
(@array)
8. Join the elements of the array seperating the elements with the ':' character
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
9. Removes trailing newline
lcfirst($string)
Hash variables
chomp($string)
chomp(@string)
10. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
basic binding operators
string manipulation functions
execution block
reverse(@array)
11. Returns a copy of the string as all lower case
comments
lc($string)
chomp($string)
Hash variables
12. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
execution block
foreach
access modes
string manipulation functions
13. _________ @arrayName) returns the size of the array
scalar context (Ex: $myArray[4] = 2)
join(':', @array)
@arrayName size
scalar
14. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
uc($string)
basic binding operators
like functions
FILEHANDLE
15. Returns all of the keys of the hash as an array
Assignment
Hash variables
chomp($string)
keys(%hash)
16. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
access modes
lcfirst($string)
last index
Assignment
17. Reverses the elements of the array
basic binding operators
reverse(%hashName)
reverse(@array)
$line=<FILEHANDLE>
18. To read an entire file into an array (one line per element)
@entireFile=<FILEHANDLE>
chomp(@string)
foreach
execution block
19. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
@ARGV
string manipulation functions
Array variables
hash functions
20. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
values(%hash)
Special array
@ARGV
Array variables
21. Removes the first element of the array shift
uc($string)
(@array)
comments
scalar
22. Returns the length of the string including escape sequences
reverse(@array)
similar data types
length($string)
Scalar variables
23. Explain how to read a line from a file handle
@ARGV
@arrayName size
$line=<FILEHANDLE>
%ENV hash array
24. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
(@array)
system commands
substr($string, $startindex, $numchars)
values(%hash)
25. Sort and array alphabetically
each(%hash)
sort(@array)
ucfirst($string)
length($string)
26. Delete the hash entry with the key given
delete($hashName{key})
split(/\s/, $string)
last index
@ARGV
27. Returns all of the values of the hash as an array
uc($string)
lcfirst($string)
values(%hash)
join(':', @array)
28. _________ in perl - An associative array
(@array)
unshift(@array, $newValue)
basic binding operators
Hash variables
29. Remove trailing newline from each element in the array
chomp(@string)
system() function
similar data types
flow-control
30. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
Special array
Editing
reverse(%hashName)
lcfirst($string)
31. Stores information about the current users environment. You can print this from the command line using printenv
command substitution
%ENV hash array
push(@array, $newValue)
keys(%hash)
32. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
@ARGV
chomp(@string)
lcfirst($string)
Assignment
33. Removes the last element from the array pop
FILEHANDLE
size string comparison operators
$hashName{keyName}="Value to Add"
(@array)
34. Returns a copy of the string as all upper case
scalar context (Ex: $myArray[4] = 2)
uc($string)
$line=<FILEHANDLE>
push(@array, $newValue)
35. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
reverse(@array)
execution block
command substitution
system commands
36. The open() statement in perl: open(________, file_mode, "filename.txt")
(@array)
keys(%hash)
Special array
FILEHANDLE
37. The two phases of creating a PERL program _______ - Execution
sort(@array)
Editing
delete($hashName{key})
newline
38. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
last index
string manipulation functions
foreach
use moduleName; Ex: use Roman;
39. scalar(@arrayName) returns the ______ of the array names
reverse(%hashName)
command substitution
lcfirst($string)
@arrayName size
40. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
length($string)
sort(@array)
(@array)
Expression character classes
41. eq - ne - lt - le - gt - ge
FILEHANDLE
print(FILEHANDLE "Data to outputn");
size string comparison operators
system commands
42. The variable that provides the last index of an array
Scalar variables
$#arrayName
system commands
delete($hashName{key})
43. Returns a copy of the string with the first letter lower case
like functions
basic binding operators
lcfirst($string)
newline
44. 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
unshift(@array, $newValue)
scalar
arithmetic comparison operators
45. Returns a copy of the string with the first letter upper case
use moduleName; Ex: use Roman;
ucfirst($string)
delete($hashName{key})
access modes
46. Adds a new element to end of the array with value $newValue
similar data types
push(@array, $newValue)
Expression character classes
substr($string, $startindex, $numchars)
47. To include modules in perl
array functions
exists($hashName{keyName})
use moduleName; Ex: use Roman;
chomp($string)
48. Add a new element to the from of the array with the value $newwValue
unshift(@array, $newValue)
chomp(@string)
Assignment
chomp($string)
49. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
access modes
Array variables
Scalar variables
delete($hashName{key})
50. Arrays can be assigned or read in _________
string manipulation functions
scalar context (Ex: $myArray[4] = 2)
chomp(@string)
$hashName{keyName}="Value to Add"