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. _________ in perl - An associative array






2. 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






3. Remove trailing newline from each element in the array






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






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






6. To write to a filehandle






7. Split string into an array using spaces as delimeter






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






9. Returns a copy of the string with the first letter upper case






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






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






12. To include modules in perl






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






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






15. 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






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






17. Explain how to read a line from a file handle






18. Returns the length of the string including escape sequences






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






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






21. Removes the first element of the array shift






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






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






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






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






26. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string






27. 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






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






29. Removes the last element from the array pop






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






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






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






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






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






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






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






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






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






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






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






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






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


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






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






45. Delete the hash entry with the key given






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






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






48. In arrays elements need not be __________






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






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