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. The variable that provides the last index of an array






2. Sort and array alphabetically






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






4. Returns the length of the string including escape sequences






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






6. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






14. Does the hash key with "keyName" exists






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






16. Arrays can be assigned or read in _________






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






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






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






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






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






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






23. 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






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






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






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






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






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






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






30. _________ in perl - An associative array






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






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






33. 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






34. Delete the hash entry with the key given






35. Removes the first element of the array shift






36. 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






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






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






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






40. To include modules in perl






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


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






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






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






45. Removes trailing newline






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






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






48. Removes the last element from the array pop






49. Reverses the elements of the array






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