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






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






3. < - > - == - <= - >= - !=






4. Sort and array alphabetically






5. Removes the first element of the array shift






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






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






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






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


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






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






12. Removes trailing newline






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






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






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






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






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






18. In arrays elements need not be __________






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






20. 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






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






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






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






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






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






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






27. Returns the length of the string including escape sequences






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






29. Does the hash key with "keyName" exists






30. 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






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






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






33. Arrays can be assigned or read in _________






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






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






36. Removes the last element from the array pop






37. To include modules in perl






38. Remove trailing newline from each element in the array






39. Delete the hash entry with the key given






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






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






42. Reverses the elements of the array






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






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






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






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






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






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






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






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