This one is actually a bug, but it’s kinda entertaining.Almost all Windows users use the default Calculator application which comes pre-installed with Windows OS. But did you know it contains a bug which has not been fixed by Microsoft yet. This bug exists in almost all Windows versions including Windows XP, Vista, 7 and Windows 8.
2. Now type the following

The answer should be 0 but its not. You will get a multiple digit number as your answer.
Windows calculator bug
Steps you have to perform
1. Open calculator (i.e.. Goto run and type calc)2. Now type the following
- Type 4.
- Take its square root by using the square root button.
- Now you will get 2.
- Subtract 2 from it.

The answer should be 0 but its not. You will get a multiple digit number as your answer.
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