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 include modules in perl






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






3. Reverses the elements of the array






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






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






6. < - > - == - <= - >= - !=






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






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






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






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






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






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






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






14. Sort and array alphabetically






15. Arrays can be assigned or read in _________






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






17. In arrays elements need not be __________






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






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






20. 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






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






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






23. Removes the first element of the array shift






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






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






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






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






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


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






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






31. Returns the length of the string including escape sequences






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






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






34. Delete the hash entry with the key given






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






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






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






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






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






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






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






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






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






44. Does the hash key with "keyName" exists






45. To write to a filehandle






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






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






48. Removes trailing newline






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






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