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