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