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






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






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






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






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






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






7. _________ in perl - An associative array






8. Delete the hash entry with the key given






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






10. Arrays can be assigned or read in _________






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






12. 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






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






14. Returns the length of the string including escape sequences






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






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






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






18. In arrays elements need not be __________






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






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






21. Does the hash key with "keyName" exists






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






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






24. To include modules in perl






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






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






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






28. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






36. Removes the last element from the array pop






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






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






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






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






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






42. To write to a filehandle






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






44. Removes the first element of the array shift






45. 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






46. 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






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






48. Remove trailing newline from each element in the array






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






50. Removes trailing newline