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


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






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






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






5. 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






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






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






8. Split string into an array using spaces as delimeter






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






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






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






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






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






14. Returns the length of the string including escape sequences






15. Reverses the elements of the array






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






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






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






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






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






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






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






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






24. To include modules in perl






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






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






27. Removes the first element of the array shift






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






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






30. 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






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






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






33. < - > - == - <= - >= - !=






34. _________ in perl - An associative array






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






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






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






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






39. 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






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






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






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






43. Does the hash key with "keyName" exists






44. Removes trailing newline






45. Removes the last element from the array pop






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






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






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






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






50. Delete the hash entry with the key given