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