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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 use of "if" "if-else" and "if-elsif-else"
flow-control
chomp($string)
split(/\s/, $string)
Special array
2. Reverses the elements of the array
command substitution
@arrayName size
reverse(@array)
sort(@array)
3. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
Assignment
Expression Quantifiers
command substitution
uc($string)
4. The variable that provides the last index of an array
Expression Quantifiers
execution block
interpreter
$#arrayName
5. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
@entireFile=<FILEHANDLE>
Assignment
scalar context (Ex: $myArray[4] = 2)
reverse(@array)
6. Returns all of the values of the hash as an array
$line=<FILEHANDLE>
values(%hash)
basic binding operators
FILEHANDLE
7. Returns a copy of the string as all lower case
hash functions
lc($string)
similar data types
Special array
8. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
scalar context (Ex: $myArray[4] = 2)
system commands
ucfirst($string)
newline
9. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
basic binding operators
Array variables
last index
array functions
10. A special system variable used to pass arguments to script
Scalar variables
Expression character classes
FILEHANDLE
@ARGV
11. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable
system() function
FILEHANDLE
use moduleName; Ex: use Roman;
(@array)
12. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
string manipulation functions
execution block
Scalar variables
array functions
13. Sort and array alphabetically
Special array
split(/\s/, $string)
sort(@array)
basic binding operators
14. _________ @arrayName) returns the size of the array
substr($string, $startindex, $numchars)
scalar context (Ex: $myArray[4] = 2)
scalar
string manipulation functions
15. To write to a filehandle
@arrayName size
print(FILEHANDLE "Data to outputn");
Expression Quantifiers
scalar context (Ex: $myArray[4] = 2)
16. scalar(@arrayName) returns the ______ of the array names
split(/\s/, $string)
flow-control
@arrayName size
$#arrayName
17. Add a new element to the from of the array with the value $newwValue
lcfirst($string)
unshift(@array, $newValue)
use moduleName; Ex: use Roman;
(@array)
18. Assignment of hash variables in perl (when oringally defining the hash)
Variable context
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
foreach
lcfirst($string)
19. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
comments
Editing
Expression Quantifiers
system commands
20. Removes trailing newline
arithmetic comparison operators
Scalar variables
uc($string)
chomp($string)
21. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
each(%hash)
lc($string)
Scalar variables
(@array)
22. Does the hash key with "keyName" exists
exists($hashName{keyName})
lcfirst($string)
delete($hashName{key})
Assignment
23. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
unshift(@array, $newValue)
hash functions
%ENV hash array
last index
24. Returns a copy of the string as all upper case
$hashName{keyName}="Value to Add"
like functions
uc($string)
interpreter
25. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
system commands
Expression Quantifiers
basic binding operators
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
26. Remove trailing newline from each element in the array
Assignment
chomp(@string)
interpreter
scalar context (Ex: $myArray[4] = 2)
27. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
chomp(@string)
size string comparison operators
use moduleName; Ex: use Roman;
last index
28. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
reverse(%hashName)
length($string)
newline
FILEHANDLE
29. 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
30. Returns all of the keys of the hash as an array
last index
delete($hashName{key})
keys(%hash)
lcfirst($string)
31. Arrays can be assigned or read in _________
@arrayName size
interpreter
push(@array, $newValue)
scalar context (Ex: $myArray[4] = 2)
32. In arrays elements need not be __________
use moduleName; Ex: use Roman;
similar data types
values(%hash)
reverse(%hashName)
33. ________ 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
basic binding operators
reverse(%hashName)
Array variables
34. To include modules in perl
push(@array, $newValue)
use moduleName; Ex: use Roman;
Array variables
string manipulation functions
35. In perl the _______ will recognize syntax errors and halt execution BEFORE it begins - and will output statements; it does not understand and the line which it encountered the error on
execution block
chomp($string)
interpreter
system() function
36. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
string manipulation functions
exists($hashName{keyName})
length($string)
reverse(@array)
37. < - > - == - <= - >= - !=
lcfirst($string)
arithmetic comparison operators
(@array)
chomp($string)
38. Explain how to read a line from a file handle
command substitution
$line=<FILEHANDLE>
@arrayName size
use moduleName; Ex: use Roman;
39. The two phases of creating a PERL program _______ - Execution
Editing
reverse(%hashName)
each(%hash)
push(@array, $newValue)
40. Returns a copy of the string with the first letter upper case
ucfirst($string)
Scalar variables
unshift(@array, $newValue)
@ARGV
41. Removes the first element of the array shift
Expression character classes
(@array)
Expression Quantifiers
scalar context (Ex: $myArray[4] = 2)
42. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
reverse(@array)
like functions
print(FILEHANDLE "Data to outputn");
command substitution
43. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
Expression character classes
@arrayName size
lc($string)
%ENV hash array
44. Delete the hash entry with the key given
substr($string, $startindex, $numchars)
@arrayName size
delete($hashName{key})
$hashName{keyName}="Value to Add"
45. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
substr($string, $startindex, $numchars)
Assignment
command substitution
FILEHANDLE
46. The open() statement in perl: open(________, file_mode, "filename.txt")
arithmetic comparison operators
system commands
reverse(%hashName)
FILEHANDLE
47. Adds a new element to end of the array with value $newValue
%ENV hash array
push(@array, $newValue)
@arrayName size
Expression character classes
48. eq - ne - lt - le - gt - ge
Expression character classes
similar data types
system() function
size string comparison operators
49. Returns a copy of the string with the first letter lower case
lcfirst($string)
Scalar variables
unshift(@array, $newValue)
reverse(@array)
50. Removes the last element from the array pop
comments
Assignment
(@array)
interpreter
Sorry!:) No result found.
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