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






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






6. Does the hash key with "keyName" exists






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






8. 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






9. Reverses the elements of the array






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






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






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






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






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






15. To write to a filehandle






16. Sort and array alphabetically






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






18. Removes the last element from the array pop






19. 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






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






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






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






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






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






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






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






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






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






29. Split string into an array using spaces as delimeter






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






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






32. 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






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






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






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






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






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






38. _________ in perl - An associative array






39. In arrays elements need not be __________






40. Arrays can be assigned or read in _________






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






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






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






44. Removes the first element of the array shift






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






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






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






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






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






50. Delete the hash entry with the key given