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