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