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






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






3. Removes the first element of the array shift






4. Sort and array alphabetically






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






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






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






8. Delete the hash entry with the key given






9. Arrays can be assigned or read in _________






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






11. Returns the length of the string including escape sequences






12. To write to a filehandle






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






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






15. Remove trailing newline from each element in the array






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






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






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






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






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






21. Does the hash key with "keyName" exists






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






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






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






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






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


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






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






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






30. Removes the last element from the array pop






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






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






33. In arrays elements need not be __________






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






35. < - > - == - <= - >= - !=






36. 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






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






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






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






40. Reverses the elements of the array






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






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






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






44. 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






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






46. _________ in perl - An associative array






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






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






49. Removes trailing newline






50. Split string into an array using spaces as delimeter