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Problem Statement for "SimpleCalculator"

Problem Statement

A simple calculator accepts the following kinds of strings as input:
  • 1) NUM+NUM
  • 2) NUM-NUM
  • 3) NUM*NUM
  • 4) NUM/NUM
where NUM is a positive integer, between 1 and 10000 inclusive that can contain leading zeros. Return the value produced by the given expression. Here +,-,*, and / denote addition, subtraction, multiplication and division respectively. All operations are done on integers, so "5/3" returns 1.

Definition

Class:
SimpleCalculator
Method:
calculate
Parameters:
String
Returns:
int
Method signature:
int calculate(String input)
(be sure your method is public)

Constraints

  • input will contain between 3 and 50 characters inclusive.
  • input will have the form where is a positive integer between 1 and 10000 inclusive, that may contain leading zeros and is one of (quotes for clarity) '+','*','-', or '/'.
  • input will not contain any spaces.

Examples

  1. "5/3"

    Returns: 1

    Remember integer division is used, so results are truncated.

  2. "15*3"

    Returns: 45

  3. "1-10000"

    Returns: -9999

    Negative results are allowed.

  4. "17+18"

    Returns: 35

  5. "0000000000000018/00000000000000000009"

    Returns: 2

    The long way of writing 18/9.

  6. "0000010000*10000"

    Returns: 100000000

  7. "10000/1"

    Returns: 10000

  8. "000000000000000000000000000000000000000000000001+3"

    Returns: 4

  9. "2334-002340"

    Returns: -6

  10. "9998*9997"

    Returns: 99950006

  11. "1231/002044"

    Returns: 0

  12. "19/000000000000000000000000000000000002"

    Returns: 9

  13. "000000010000+00000000010000"

    Returns: 20000

  14. "99/11"

    Returns: 9

  15. "99/12"

    Returns: 8

  16. "094-00094"

    Returns: 0

  17. "000000238+00000002142"

    Returns: 2380

  18. "23-000000000002234"

    Returns: -2211

  19. "09876+01234"

    Returns: 11110

  20. "09876*01234"

    Returns: 12186984

  21. "09876/01234"

    Returns: 8

  22. "09876-01234"

    Returns: 8642

  23. "0000000000000018/00000000000000000009"

    Returns: 2

  24. "1/1"

    Returns: 1

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