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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. To include modules in perl
(@array)
use moduleName; Ex: use Roman;
(@array)
array functions
2. _________ in perl - An associative array
string manipulation functions
reverse(%hashName)
foreach
Hash variables
3. The open() statement in perl: open(________, file_mode, "filename.txt")
scalar
interpreter
Variable context
FILEHANDLE
4. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
execution block
like functions
Hash variables
foreach
5. Returns a copy of the string with the first letter lower case
lcfirst($string)
use moduleName; Ex: use Roman;
lc($string)
Scalar variables
6. Sort and array alphabetically
sort(@array)
chomp($string)
scalar context (Ex: $myArray[4] = 2)
newline
7. The variable that provides the last index of an array
Expression character classes
push(@array, $newValue)
$#arrayName
interpreter
8. Returns a copy of the string with the first letter upper case
Expression Quantifiers
values(%hash)
reverse(@array)
ucfirst($string)
9. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
Assignment
each(%hash)
chomp(@string)
Scalar variables
10. _________ @arrayName) returns the size of the array
flow-control
scalar
access modes
Special array
11. Returns a copy of the string as all lower case
keys(%hash)
lc($string)
Expression Quantifiers
split(/\s/, $string)
12. Stores information about the current users environment. You can print this from the command line using printenv
%ENV hash array
join(':', @array)
like functions
values(%hash)
13. scalar(@arrayName) returns the ______ of the array names
@arrayName size
push(@array, $newValue)
arithmetic comparison operators
FILEHANDLE
14. Returns a copy of the string as all upper case
split(/\s/, $string)
last index
unshift(@array, $newValue)
uc($string)
15. Does the hash key with "keyName" exists
exists($hashName{keyName})
Scalar variables
comments
Special array
16. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
size string comparison operators
Assignment
Hash variables
reverse(%hashName)
17. Returns all of the values of the hash as an array
values(%hash)
FILEHANDLE
keys(%hash)
use moduleName; Ex: use Roman;
18. Delete the hash entry with the key given
Scalar variables
hash functions
like functions
delete($hashName{key})
19. Returns the length of the string including escape sequences
delete($hashName{key})
chomp($string)
length($string)
sort(@array)
20. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
Array variables
chomp($string)
Expression Quantifiers
hash functions
21. A special system variable used to pass arguments to script
Expression Quantifiers
last index
@ARGV
scalar context (Ex: $myArray[4] = 2)
22. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
Special array
each(%hash)
use moduleName; Ex: use Roman;
(@array)
23. < - > - == - <= - >= - !=
arithmetic comparison operators
sort(@array)
@entireFile=<FILEHANDLE>
ucfirst($string)
24. Remove trailing newline from each element in the array
foreach
Assignment
chomp(@string)
similar data types
25. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
substr($string, $startindex, $numchars)
FILEHANDLE
hash functions
similar data types
26. Removes the last element from the array pop
@entireFile=<FILEHANDLE>
(@array)
command substitution
length($string)
27. Assignment of a hash variable for a single hash element
$hashName{keyName}="Value to Add"
scalar
newline
comments
28. The three basic ________ of the open() function: > write - >> append - < read file
uc($string)
access modes
Array variables
lc($string)
29. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
last index
split(/\s/, $string)
@arrayName size
(@array)
30. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
array functions
chomp(@string)
unshift(@array, $newValue)
newline
31. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
split(/\s/, $string)
newline
Special array
$hashName{keyName}="Value to Add"
32. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
sort(@array)
system commands
flow-control
string manipulation functions
33. Explain how to read a line from a file handle
length($string)
lcfirst($string)
$line=<FILEHANDLE>
each(%hash)
34. Reverses the elements of the array
hash functions
reverse(@array)
chomp($string)
$#arrayName
35. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
Array variables
array functions
execution block
%ENV hash array
36. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
execution block
Scalar variables
substr($string, $startindex, $numchars)
ucfirst($string)
37. The two phases of creating a PERL program _______ - Execution
(@array)
interpreter
length($string)
Editing
38. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
interpreter
lc($string)
comments
unshift(@array, $newValue)
39. Returns all of the keys of the hash as an array
keys(%hash)
@ARGV
print(FILEHANDLE "Data to outputn");
arithmetic comparison operators
40. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
Special array
execution block
reverse(@array)
interpreter
41. Add a new element to the from of the array with the value $newwValue
@arrayName size
Variable context
unshift(@array, $newValue)
@entireFile=<FILEHANDLE>
42. Join the elements of the array seperating the elements with the ':' character
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
43. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
Array variables
system commands
chomp($string)
lcfirst($string)
44. The four types of loops in perl: while - until - for - ________
@ARGV
sort(@array)
foreach
command substitution
45. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
split(/\s/, $string)
foreach
newline
Variable context
46. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the
sort(@array)
command substitution
Variable context
delete($hashName{key})
47. Adds a new element to end of the array with value $newValue
flow-control
push(@array, $newValue)
foreach
exists($hashName{keyName})
48. In arrays elements need not be __________
Scalar variables
similar data types
substr($string, $startindex, $numchars)
newline
49. eq - ne - lt - le - gt - ge
size string comparison operators
push(@array, $newValue)
flow-control
unshift(@array, $newValue)
50. The use of "if" "if-else" and "if-elsif-else"
flow-control
@entireFile=<FILEHANDLE>
execution block
length($string)
Sorry!:) No result found.
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