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