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