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