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






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






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






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






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






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






7. Sort and array alphabetically






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






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






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






11. 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






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






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






14. To include modules in perl






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






16. Delete the hash entry with the key given






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






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






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






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






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






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






23. < - > - == - <= - >= - !=






24. In arrays elements need not be __________






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






26. Arrays can be assigned or read in _________






27. 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






28. Reverses the elements of the array






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






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






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






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






33. Returns the length of the string including escape sequences






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






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






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






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






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






39. Does the hash key with "keyName" exists






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






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






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






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






44. To write to a filehandle






45. Removes the last element from the array pop






46. Split string into an array using spaces as delimeter






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






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






49. Removes trailing newline






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