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