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. Delete the hash entry with the key given






3. Removes the last element from the array pop






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






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






6. Split string into an array using spaces as delimeter






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






8. Arrays can be assigned or read in _________






9. 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


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






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






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






13. _________ in perl - An associative array






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






15. 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






16. Reverses the elements of the array






17. 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






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






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






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






21. Sort and array alphabetically






22. Remove trailing newline from each element in the array






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






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






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






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






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






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






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






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






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






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






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






34. 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






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






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






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






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






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






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






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






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






43. In arrays elements need not be __________






44. Removes the first element of the array shift






45. To include modules in perl






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






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






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






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






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