Test your basic knowledge |

Perl Programming

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 give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4






2. The two primary methods of executing _______ in perl: - system("command args") - - `command args`






3. Two ____________ in regular expressions: =~ Contains - !~ Does not contain






4. Returns a copy of the string as all upper case






5. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program






6. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)






7. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)






8. < - > - == - <= - >= - !=






9. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)






10. The variable that provides the last index of an array






11. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)






12. To write to a filehandle






13. Returns a copy of the string as all lower case






14. Reverses the elements of the array






15. scalar(@arrayName) returns the ______ of the array names






16. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")






17. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value






18. Removes trailing newline






19. Sort and array alphabetically






20. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)






21. Stores information about the current users environment. You can print this from the command line using printenv






22. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters






23. 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






24. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;






25. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line






26. To read an entire file into an array (one line per element)






27. Assignment of hash variables in perl (when oringally defining the hash)






28. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these






29. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)






30. _________ @arrayName) returns the size of the array






31. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value






32. The use of "if" "if-else" and "if-elsif-else"






33. 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






34. Returns all of the values of the hash as an array






35. The open() statement in perl: open(________, file_mode, "filename.txt")






36. Join the elements of the array seperating the elements with the ':' character

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


37. Remove trailing newline from each element in the array






38. Split string into an array using spaces as delimeter






39. _________ in perl - An associative array






40. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character






41. Returns all of the keys of the hash as an array






42. eq - ne - lt - le - gt - ge






43. To include modules in perl






44. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED






45. Adds a new element to end of the array with value $newValue






46. The four types of loops in perl: while - until - for - ________






47. Returns the length of the string including escape sequences






48. The three basic ________ of the open() function: > write - >> append - < read file






49. Does the hash key with "keyName" exists






50. Add a new element to the from of the array with the value $newwValue