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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. Delete the hash entry with the key given






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






3. Removes the first element of the array shift






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






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






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






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






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






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






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






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






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






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


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






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






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






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






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






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






21. Does the hash key with "keyName" exists






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






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






24. 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






25. Remove trailing newline from each element in the array






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






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






28. Removes the last element from the array pop






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






30. Sort and array alphabetically






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






32. To include modules in perl






33. To write to a filehandle






34. Returns the length of the string including escape sequences






35. In arrays elements need not be __________






36. Removes trailing newline






37. < - > - == - <= - >= - !=






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






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






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






41. 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






42. Arrays can be assigned or read in _________






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






44. _________ in perl - An associative array






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






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






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






48. Reverses the elements of the array






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






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






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