Hi,

The question is kind of Abstract. There definitely is a bug with the functionality of the Calculator. I would say we could categorize Bug report outline as follows.

BugId : Autogenerated by Tool or as maintained by Tester.
BugSummary : Addition functionality failing for Even numbers.
Application : Calculator.
Bug Description : Whenever User tries to add 2 even number, the resultant is displayed as one more than the actual expected result. Functionality works fine correctly for Odd Number addition.
Severity : High.
Priority : High.
TestDataUsed : 2+2, 4+4, 6+6..........1+1,3+3........
Date Detected : ##/##/####
Detected By : Tester Name.

We would also have to test whether 2 odd Numbers are added up correctly on consecutive operations. Incase the result fails for the second attempt, we would have to change our Bug Report accordingly.

Cheers....