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Problem Statement for "Datatype"

Problem Statement

When reading data as a string of characters, it is often useful to convert the data into a different datatype, which is easier to work with than a string of characters. For example, many operations are made much easier if the string of characters "123" is converted from a string of characters into a different datatype, such as an int or a float. We want to determine the best datatype to use for some data, given a string of characters. For the purposes of this problem, we will consider converting a string of characters into one of 4 datatypes:

  • "INTEGER" - if the string consists only of the digits '0' - '9'.
  • "BOOLEAN" - if the string is "true" or "false" (ignoring case)
  • "DECIMAL" - if the string contains only digits '0' - '9', and exactly one decimal point ('.'). "123.12", ".123", and "124." are all of type "DECIMAL". Note that by this definition the string "." is classified as a "DECIMAL"
  • "STRING" - if the string is none of the other datatypes.

Your task is to write a class Datatype with a method getType that takes a String, var, and classifies it into one of the above four types, and returns the datatype as a String.

Definition

Class:
Datatype
Method:
getType
Parameters:
String
Returns:
String
Method signature:
String getType(String var)
(be sure your method is public)

Constraints

  • var will contain between 1 and 50 characters, inclusive.
  • Each character in var will be a letter ('a'-'z' or 'A'-'Z'), a digit ('0'-'9'), a decimal point ('.'), a space (' '), or one of the following characters: ,/<>?;':"[]{}\|`~!@#$%^*()_+-=&

Examples

  1. "123"

    Returns: "INTEGER"

  2. "324.1"

    Returns: "DECIMAL"

  3. ".12"

    Returns: "DECIMAL"

  4. "453."

    Returns: "DECIMAL"

  5. "770.555.1212"

    Returns: "STRING"

  6. "TrUe"

    Returns: "BOOLEAN"

  7. "this is just a string"

    Returns: "STRING"

  8. "453 ducks flew 4739.45 miles."

    Returns: "STRING"

  9. "."

    Returns: "DECIMAL"

  10. "false"

    Returns: "BOOLEAN"

  11. "True"

    Returns: "BOOLEAN"

  12. "0000"

    Returns: "INTEGER"

  13. "TRUES"

    Returns: "STRING"

  14. "cow.x"

    Returns: "STRING"

  15. "1a4"

    Returns: "STRING"

  16. "123.123."

    Returns: "STRING"

  17. "trUe"

    Returns: "BOOLEAN"

  18. "TruE"

    Returns: "BOOLEAN"

  19. "128.11.11"

    Returns: "STRING"

  20. ".e"

    Returns: "STRING"

  21. "FALSETRUE"

    Returns: "STRING"

  22. "9.a9"

    Returns: "STRING"

  23. "STRING"

    Returns: "STRING"

  24. "12345678911234567891123456789112345678911234567891"

    Returns: "INTEGER"

  25. "========.======="

    Returns: "STRING"

  26. "3.4.7"

    Returns: "STRING"

  27. "%"

    Returns: "STRING"

  28. "9999999999999999999999999999999"

    Returns: "INTEGER"

  29. "@#$.@#$"

    Returns: "STRING"

  30. "."

    Returns: "DECIMAL"

  31. "4 5"

    Returns: "STRING"

  32. "0"

    Returns: "INTEGER"

  33. "a.a"

    Returns: "STRING"

  34. " true"

    Returns: "STRING"

  35. "-15"

    Returns: "STRING"

  36. "TRUE"

    Returns: "BOOLEAN"

  37. "1..2"

    Returns: "STRING"

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