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