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