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






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






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






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






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






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






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






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






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






10. Removes the first element of the array shift






11. Removes the last element from the array pop






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






13. Split string into an array using spaces as delimeter






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






15. In arrays elements need not be __________






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






17. Reverses the elements of the array






18. < - > - == - <= - >= - !=






19. Removes trailing newline






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






21. Arrays can be assigned or read in _________






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






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






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






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






26. Delete the hash entry with the key given






27. _________ in perl - An associative array






28. Remove trailing newline from each element in the array






29. To write to a filehandle






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






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






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






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






34. Returns the length of the string including escape sequences






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






36. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






45. To include modules in perl






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






47. Sort and array alphabetically






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






49. 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






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