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






3. 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






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






5. In arrays elements need not be __________






6. Arrays can be assigned or read in _________






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






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






9. Does the hash key with "keyName" exists






10. Removes the last element from the array pop






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






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






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






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






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






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






17. To write to a filehandle






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






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






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






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






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






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






24. _________ in perl - An associative array






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

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






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






28. Returns the length of the string including escape sequences






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






30. Sort and array alphabetically






31. Reverses the elements of the array






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






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






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






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






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






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






38. < - > - == - <= - >= - !=






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






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






41. Split string into an array using spaces as delimeter






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






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






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






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






47. Remove trailing newline from each element in the array






48. Removes trailing newline






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






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







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Can you answer 50 questions in 15 minutes?


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