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






2. Arrays can be assigned or read in _________






3. To write to a filehandle






4. Sort and array alphabetically






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






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






7. 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






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






9. 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






10. _________ in perl - An associative array






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






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






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






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






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






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






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






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






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






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






21. 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






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






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






24. In arrays elements need not be __________






25. Reverses the elements of the array






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






27. Removes trailing newline






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


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






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






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






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






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






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






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






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






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






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






39. Does the hash key with "keyName" exists






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






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






42. To include modules in perl






43. Removes the last element from the array pop






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






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






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






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






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






49. Split string into an array using spaces as delimeter






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