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. Removes trailing newline






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






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






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






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






6. 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






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






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






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






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






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






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






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






14. Removes the first element of the array shift






15. < - > - == - <= - >= - !=






16. To write to a filehandle






17. Delete the hash entry with the key given






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






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






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






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






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


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






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






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






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






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






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






29. Remove trailing newline from each element in the array






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






31. Does the hash key with "keyName" exists






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






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






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






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






36. 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






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






38. Arrays can be assigned or read in _________






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






40. _________ in perl - An associative array






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






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






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






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






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






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






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






48. To include modules in perl






49. Sort and array alphabetically






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