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. To include modules in perl






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






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






5. Removes the first element of the array shift






6. Returns the length of the string including escape sequences






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






8. Delete the hash entry with the key given






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






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






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






12. _________ in perl - An associative array






13. Split string into an array using spaces as delimeter






14. Sort and array alphabetically






15. Remove trailing newline from each element in the array






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






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






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






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






20. Does the hash key with "keyName" exists






21. 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






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






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






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






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






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






27. Arrays can be assigned or read in _________






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






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






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






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






32. Removes the last element from the array pop






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






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






35. 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






36. To write to a filehandle






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






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






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






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






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






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






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






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






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






46. Reverses the elements of the array






47. Removes trailing newline






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






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






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