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