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. Removes the first element of the array shift






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






4. Sort and array alphabetically






5. Returns the length of the string including escape sequences






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






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






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






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






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






11. Delete the hash entry with the key given






12. Does the hash key with "keyName" exists






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






14. Arrays can be assigned or read in _________






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






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






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






18. Remove trailing newline from each element in the array






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






20. 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






21. In arrays elements need not be __________






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






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






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






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






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






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






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






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






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






31. _________ in perl - An associative array






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






33. To include modules in perl






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






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






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






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






38. Reverses the elements of the array






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






40. 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






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






42. 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






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






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






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






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






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






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






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






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