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






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






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






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






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






6. Arrays can be assigned or read in _________






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






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






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


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






11. 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






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






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






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






15. Returns the length of the string including escape sequences






16. To write to a filehandle






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






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






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






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






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






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






23. Removes the first element of the array shift






24. To include modules in perl






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






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






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






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






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






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






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






33. Does the hash key with "keyName" exists






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






35. Reverses the elements of the array






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






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






38. In arrays elements need not be __________






39. 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






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






41. Remove trailing newline from each element in the array






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






43. _________ in perl - An associative array






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






46. Removes trailing newline






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






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






49. Removes the last element from the array pop






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