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

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






3. 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






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






5. In arrays elements need not be __________






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






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






8. Sort and array alphabetically






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






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






11. Returns the length of the string including escape sequences






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






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






14. < - > - == - <= - >= - !=






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






16. Does the hash key with "keyName" exists






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






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






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






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






21. Removes trailing newline






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






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






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






25. 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






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






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






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






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






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






31. Arrays can be assigned or read in _________






32. Delete the hash entry with the key given






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






34. 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






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






36. To include modules in perl






37. _________ in perl - An associative array






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






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






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






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






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






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






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






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






46. Remove trailing newline from each element in the array






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






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






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






50. Removes the first element of the array shift