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