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






2. Reverses the elements of the array






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






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






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






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






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






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






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






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






11. Split string into an array using spaces as delimeter






12. Returns the length of the string including escape sequences






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






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






15. Delete the hash entry with the key given






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






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






18. Removes trailing newline






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






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






21. 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






22. _________ in perl - An associative array






23. Arrays can be assigned or read in _________






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

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






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






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






28. To include modules in perl






29. Sort and array alphabetically






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






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






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






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






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






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






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






37. Remove trailing newline from each element in the array






38. 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






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






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






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






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






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






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






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






46. In arrays elements need not be __________






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






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






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






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