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. 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






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






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






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






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






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






7. Delete the hash entry with the key given






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






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






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






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






12. < - > - == - <= - >= - !=






13. 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






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






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






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






17. _________ in perl - An associative array






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






19. To include modules in perl






20. Does the hash key with "keyName" exists






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

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






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






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






25. Removes the last element from the array pop






26. Remove trailing newline from each element in the array






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






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






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






30. Sort and array alphabetically






31. Removes trailing newline






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






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






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






35. In arrays elements need not be __________






36. Returns the length of the string including escape sequences






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






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






39. Removes the first element of the array shift






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






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






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






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






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






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






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






47. Split string into an array using spaces as delimeter






48. To write to a filehandle






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






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