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






2. Split string into an array using spaces as delimeter






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






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






5. 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






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






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






8. 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






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






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






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






12. Returns the length of the string including escape sequences






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






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






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






16. Remove trailing newline from each element in the array






17. < - > - == - <= - >= - !=






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






19. Delete the hash entry with the key given






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






21. To write to a filehandle






22. Removes the first element of the array shift






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






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






25. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






33. In arrays elements need not be __________






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






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






36. 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






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






38. To include modules in perl






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






40. Removes the last element from the array pop






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






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






43. Removes trailing newline






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






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






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






47. _________ in perl - An associative array






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






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






50. Arrays can be assigned or read in _________