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