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






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






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






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






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






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






7. Reverses the elements of the array






8. 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






9. To write to a filehandle






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






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






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






13. Removes the last element from the array pop






14. Removes trailing newline






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






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






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


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






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






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






21. _________ in perl - An associative array






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






23. In arrays elements need not be __________






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






25. Split string into an array using spaces as delimeter






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






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






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






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






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






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






32. Removes the first element of the array shift






33. 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






34. Arrays can be assigned or read in _________






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






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






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






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






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






40. Does the hash key with "keyName" exists






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






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






43. Delete the hash entry with the key given






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






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






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






47. 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






48. < - > - == - <= - >= - !=






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






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