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