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






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






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






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






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






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






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






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






9. 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






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






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






12. Does the hash key with "keyName" exists






13. Arrays can be assigned or read in _________






14. < - > - == - <= - >= - !=






15. Split string into an array using spaces as delimeter






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






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






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






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






20. Returns the length of the string including escape sequences






21. Removes the last element from the array pop






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






23. Removes trailing newline






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






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






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






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






28. To write to a filehandle






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






30. Reverses the elements of the array






31. Delete the hash entry with the key given






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






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






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






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


36. _________ in perl - An associative array






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






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






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






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






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






42. In arrays elements need not be __________






43. Remove trailing newline from each element in the array






44. Removes the first element of the array shift






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






46. 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






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






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






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






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