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. _________ in perl - An associative array






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






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






5. Arrays can be assigned or read in _________






6. 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






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






8. Removes trailing newline






9. < - > - == - <= - >= - !=






10. Remove trailing newline from each element in the array






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






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






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






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






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






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






17. To include modules in perl






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






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






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






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






22. Removes the first element of the array shift






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






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






25. Returns the length of the string including escape sequences






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






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






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






29. Removes the last element from the array pop






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






31. Reverses the elements of the array






32. Sort and array alphabetically






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






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






35. Delete the hash entry with the key given






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






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






38. To write to a filehandle






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






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






41. 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






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






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






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






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






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






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






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






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






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