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. Removes the last element from the array pop






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






3. Does the hash key with "keyName" exists






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






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






6. Delete the hash entry with the key given






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






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






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






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






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






12. Reverses the elements of the array






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






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






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






16. Remove trailing newline from each element in the array






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






18. Removes trailing newline






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






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






21. In arrays elements need not be __________






22. Arrays can be assigned or read in _________






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






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






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






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






27. _________ in perl - An associative array






28. Returns the length of the string including escape sequences






29. < - > - == - <= - >= - !=






30. 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






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






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






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






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






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






36. Split string into an array using spaces as delimeter






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






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






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






40. Removes the first element of the array shift






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






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






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






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






45. To write to a filehandle






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






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






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






49. Sort and array alphabetically






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