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