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






2. In arrays elements need not be __________






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






4. Remove trailing newline from each element in the array






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






6. Reverses the elements of the array






7. Does the hash key with "keyName" exists






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






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






10. Returns the length of the string including escape sequences






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






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






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






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






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






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






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






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






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






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






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






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






23. To write to a filehandle






24. 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






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






26. Arrays can be assigned or read in _________






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






28. Removes the last element from the array pop






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






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






31. 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






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






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






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






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






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






37. 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






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






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






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






41. Delete the hash entry with the key given






42. Split string into an array using spaces as delimeter






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






44. Sort and array alphabetically






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






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






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






48. Removes trailing newline






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






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







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