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






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






3. Removes trailing newline






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






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






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






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






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






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






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






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






12. Arrays can be assigned or read in _________






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






14. 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






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






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






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






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






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






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






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






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






25. To include modules in perl






26. Returns the length of the string including escape sequences






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






28. Removes the last element from the array pop






29. Reverses the elements of the array






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






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






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


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






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






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






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






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






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






39. In arrays elements need not be __________






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






41. 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






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






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






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






45. Delete the hash entry with the key given






46. _________ in perl - An associative array






47. Split string into an array using spaces as delimeter






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






49. Removes the first element of the array shift






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