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. Returns a copy of the string as all upper case






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






3. Returns the length of the string including escape sequences






4. < - > - == - <= - >= - !=






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






6. Remove trailing newline from each element in the array






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






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






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






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






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






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






13. 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






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






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






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






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






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






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






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






22. Removes the first element of the array shift






23. Removes the last element from the array pop






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






25. To include modules in perl






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






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






29. In arrays elements need not be __________






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


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






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






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






34. Reverses the elements of the array






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






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






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






38. Delete the hash entry with the key given






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






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






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






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






43. Sort and array alphabetically






44. Removes trailing newline






45. Split string into an array using spaces as delimeter






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






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






48. Arrays can be assigned or read in _________






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






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