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






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






3. Remove trailing newline from each element in the array






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






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






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






7. Sort and array alphabetically






8. Delete the hash entry with the key given






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






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






11. _________ in perl - An associative array






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






13. To write to a filehandle






14. Returns the length of the string including escape sequences






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






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






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






18. 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






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






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






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






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






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






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






25. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






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






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






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






36. To include modules in perl






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






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






39. 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






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






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






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






43. Removes trailing newline






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






45. < - > - == - <= - >= - !=






46. Reverses the elements of the array






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


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






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






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