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. _________ @arrayName) returns the size of the array






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






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






4. < - > - == - <= - >= - !=






5. 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






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






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






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






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






10. In arrays elements need not be __________






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






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






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






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






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






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






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






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






19. Sort and array alphabetically






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






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






22. Does the hash key with "keyName" exists






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






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






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






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






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






28. Returns the length of the string including escape sequences






29. Remove trailing newline from each element in the array






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






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






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






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






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






35. Removes the first element of the array shift






36. Split string into an array using spaces as delimeter






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






38. Reverses the elements of the array






39. To include modules in perl






40. Removes the last element from the array pop






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






42. Delete the hash entry with the key given






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






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






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






46. 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






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






48. _________ in perl - An associative array






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






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