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