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






3. Does the hash key with "keyName" exists






4. Removes the last element from the array pop






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






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






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






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






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






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






11. To write to a filehandle






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


13. < - > - == - <= - >= - !=






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






15. Removes the first element of the array shift






16. 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






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






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






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






20. Split string into an array using spaces as delimeter






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






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






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






24. _________ in perl - An associative array






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






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






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






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






29. 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






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






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






32. In arrays elements need not be __________






33. Sort and array alphabetically






34. Removes trailing newline






35. Arrays can be assigned or read in _________






36. Returns the length of the string including escape sequences






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






38. 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






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






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






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






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






43. Reverses the elements of the array






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






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






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






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






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






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






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