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






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






3. To write to a filehandle






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






5. Sort and array alphabetically






6. To include modules in perl






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






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






9. < - > - == - <= - >= - !=






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






13. Returns the length of the string including escape sequences






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






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






16. Remove trailing newline from each element in the array






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






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






19. Does the hash key with "keyName" exists






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






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






22. Reverses the elements of the array






23. Removes trailing newline






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






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






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






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






28. In arrays elements need not be __________






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






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






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






32. 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


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






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






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






36. Delete the hash entry with the key given






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






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






39. Split string into an array using spaces as delimeter






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






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






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






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






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






46. Removes the last element from the array pop






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






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






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






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







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