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. Returns a copy of the string as all lower case






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


4. 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






5. < - > - == - <= - >= - !=






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






7. Does the hash key with "keyName" exists






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






9. In arrays elements need not be __________






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






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






12. Removes the first element of the array shift






13. Delete the hash entry with the key given






14. To include modules in perl






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






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






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






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






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






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






21. Arrays can be assigned or read in _________






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






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






24. Removes the last element from the array pop






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






26. Sort and array alphabetically






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






28. To write to a filehandle






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






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






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






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






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






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






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






36. Returns the length of the string including escape sequences






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






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






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






40. 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






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






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






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






44. 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






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






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






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






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






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






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