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. Remove trailing newline from each element in the array






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






4. In arrays elements need not be __________






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






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






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






8. Removes the last element from the array pop






9. 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






10. 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






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






12. _________ in perl - An associative array






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






14. Delete the hash entry with the key given






15. To write to a filehandle






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






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






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






19. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)






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






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






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






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






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






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






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






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






28. Does the hash key with "keyName" exists






29. Sort and array alphabetically






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






31. Removes trailing newline






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






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






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






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






36. To include modules in perl






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






38. Split string into an array using spaces as delimeter






39. Returns the length of the string including escape sequences






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






41. Removes the first element of the array shift






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






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






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






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






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






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






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






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






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