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