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






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






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






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






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






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






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






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






9. Returns the length of the string including escape sequences






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






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






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






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






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






15. In arrays elements need not be __________






16. Removes trailing newline






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






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






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






20. Split string into an array using spaces as delimeter






21. Delete the hash entry with the key given






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






23. 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






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






25. Does the hash key with "keyName" exists






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






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






28. _________ in perl - An associative array






29. To write to a filehandle






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






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






32. 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






33. Removes the last element from the array pop






34. Remove trailing newline from each element in the array






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






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






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






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






39. Arrays can be assigned or read in _________






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






41. Removes the first element of the array shift






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






43. Sort and array alphabetically






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






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






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


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






48. 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






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






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