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






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






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






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






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






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






7. Returns a copy of the string with the first letter lower case






8. Removes the first element of the array shift






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






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






11. _________ in perl - An associative array






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






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






14. To write to a filehandle






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






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


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






18. 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






19. Returns the length of the string including escape sequences






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






21. Arrays can be assigned or read in _________






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






23. Reverses the elements of the array






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






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






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






27. Remove trailing newline from each element in the array






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






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






30. A special system variable used to pass arguments to script






31. Sort and array alphabetically






32. 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






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






34. Assignment of a hash variable for a single hash element






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






36. In arrays elements need not be __________






37. Removes trailing newline






38. < - > - == - <= - >= - !=






39. Removes the last element from the array pop






40. 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






41. Delete the hash entry with the key given






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






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






44. Split string into an array using spaces as delimeter






45. The two phases of creating a PERL program _______ - Execution






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






47. To include modules in perl






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






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






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