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






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






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






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






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






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






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






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






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






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






11. Split string into an array using spaces as delimeter






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






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






14. Remove trailing newline from each element in the array






15. 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






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






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






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






19. Arrays can be assigned or read in _________






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






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


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






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






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






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






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






27. Removes trailing newline






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






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






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






31. Reverses the elements of the array






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






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






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






35. Removes the last element from the array pop






36. Delete the hash entry with the key given






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






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






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






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






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






42. To include modules in perl






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






44. Does the hash key with "keyName" exists






45. Removes the first element of the array shift






46. _________ in perl - An associative array






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






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






49. 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






50. In arrays elements need not be __________