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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. Returns a copy of the string as all lower case
lc($string)
Array variables
flow-control
chomp($string)
2. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
Expression character classes
lcfirst($string)
Array variables
comments
3. Join the elements of the array seperating the elements with the ':' character
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
4. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable
@arrayName size
system() function
last index
chomp($string)
5. < - > - == - <= - >= - !=
comments
each(%hash)
last index
arithmetic comparison operators
6. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
chomp(@string)
Scalar variables
basic binding operators
Expression Quantifiers
7. Does the hash key with "keyName" exists
$hashName{keyName}="Value to Add"
@arrayName size
exists($hashName{keyName})
uc($string)
8. scalar(@arrayName) returns the ______ of the array names
Editing
@arrayName size
command substitution
hash functions
9. In arrays elements need not be __________
scalar
similar data types
hash functions
sort(@array)
10. Adds a new element to end of the array with value $newValue
execution block
@arrayName size
push(@array, $newValue)
$line=<FILEHANDLE>
11. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
Scalar variables
similar data types
Hash variables
(@array)
12. Removes the first element of the array shift
use moduleName; Ex: use Roman;
split(/\s/, $string)
flow-control
(@array)
13. Delete the hash entry with the key given
delete($hashName{key})
Expression character classes
newline
size string comparison operators
14. To include modules in perl
Hash variables
@ARGV
size string comparison operators
use moduleName; Ex: use Roman;
15. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
reverse(%hashName)
reverse(@array)
Hash variables
size string comparison operators
16. Add a new element to the from of the array with the value $newwValue
$#arrayName
keys(%hash)
unshift(@array, $newValue)
access modes
17. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
system commands
FILEHANDLE
Scalar variables
Special array
18. _________ @arrayName) returns the size of the array
chomp($string)
$hashName{keyName}="Value to Add"
scalar
@entireFile=<FILEHANDLE>
19. Explain how to read a line from a file handle
use moduleName; Ex: use Roman;
size string comparison operators
delete($hashName{key})
$line=<FILEHANDLE>
20. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
Expression Quantifiers
$line=<FILEHANDLE>
hash functions
array functions
21. Arrays can be assigned or read in _________
(@array)
scalar context (Ex: $myArray[4] = 2)
values(%hash)
Assignment
22. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
execution block
values(%hash)
interpreter
@arrayName size
23. Returns a copy of the string with the first letter upper case
ucfirst($string)
system() function
$#arrayName
Editing
24. Removes the last element from the array pop
system() function
similar data types
basic binding operators
(@array)
25. Stores information about the current users environment. You can print this from the command line using printenv
%ENV hash array
@arrayName size
command substitution
reverse(%hashName)
26. Sort and array alphabetically
system() function
comments
interpreter
sort(@array)
27. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
each(%hash)
Variable context
$#arrayName
string manipulation functions
28. To write to a filehandle
Array variables
sort(@array)
print(FILEHANDLE "Data to outputn");
Hash variables
29. The four types of loops in perl: while - until - for - ________
unshift(@array, $newValue)
(@array)
join(':', @array)
foreach
30. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
Variable context
execution block
Hash variables
similar data types
31. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
Editing
Assignment
Array variables
(@array)
32. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
sort(@array)
Assignment
exists($hashName{keyName})
array functions
33. Assignment of a hash variable for a single hash element
@entireFile=<FILEHANDLE>
(@array)
$hashName{keyName}="Value to Add"
flow-control
34. Returns all of the keys of the hash as an array
Special array
Array variables
size string comparison operators
keys(%hash)
35. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
Expression character classes
array functions
access modes
join(':', @array)
36. Returns the length of the string including escape sequences
push(@array, $newValue)
array functions
length($string)
(@array)
37. Returns all of the values of the hash as an array
basic binding operators
values(%hash)
like functions
Editing
38. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
Variable context
@ARGV
Assignment
like functions
39. The variable that provides the last index of an array
delete($hashName{key})
command substitution
length($string)
$#arrayName
40. 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
(@array)
unshift(@array, $newValue)
system commands
interpreter
41. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
execution block
string manipulation functions
last index
uc($string)
42. Returns a copy of the string with the first letter lower case
values(%hash)
(@array)
lcfirst($string)
Hash variables
43. The three basic ________ of the open() function: > write - >> append - < read file
$hashName{keyName}="Value to Add"
access modes
comments
array functions
44. 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
values(%hash)
join(':', @array)
@entireFile=<FILEHANDLE>
command substitution
45. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
$line=<FILEHANDLE>
substr($string, $startindex, $numchars)
scalar context (Ex: $myArray[4] = 2)
Variable context
46. Assignment of hash variables in perl (when oringally defining the hash)
$hashName{keyName}="Value to Add"
@ARGV
command substitution
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
47. The open() statement in perl: open(________, file_mode, "filename.txt")
basic binding operators
Array variables
Variable context
FILEHANDLE
48. To read an entire file into an array (one line per element)
Hash variables
@entireFile=<FILEHANDLE>
print(FILEHANDLE "Data to outputn");
basic binding operators
49. The use of "if" "if-else" and "if-elsif-else"
join(':', @array)
each(%hash)
flow-control
(@array)
50. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
newline
Variable context
scalar
$hashName{keyName}="Value to Add"