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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 all of the keys of the hash as an array






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






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






4. 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






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






6. Reverses the elements of the array






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






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






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






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






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






12. Delete the hash entry with the key given






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






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






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






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


17. Returns the length of the string including escape sequences






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






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






20. In arrays elements need not be __________






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






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






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






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






26. To write to a filehandle






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






28. Split string into an array using spaces as delimeter






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






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






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






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






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






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






35. To include modules in perl






36. Removes the first element of the array shift






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






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






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






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






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






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






43. Sort and array alphabetically






44. < - > - == - <= - >= - !=






45. Arrays can be assigned or read in _________






46. _________ in perl - An associative array






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






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






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






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






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