# I got a "nan" result in Visual Basic Studio

**URL:** <https://fortran-lang.discourse.group/t/i-got-a-nan-result-in-visual-basic-studio/6628>\
**Category:** Visual Studio Code\
**Created:** [October 12, 2023, 1:52pm UTC](https://fortran-lang.discourse.group/t/i-got-a-nan-result-in-visual-basic-studio/6628 "2023-10-12T13:52:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mahmoud96](https://avatars.discourse-cdn.com/v4/letter/m/e99b99/32.png) [@Mahmoud96](https://fortran-lang.discourse.group/u/Mahmoud96)\
**Post date:** [October 12, 2023, 1:52pm UTC](https://fortran-lang.discourse.group/t/i-got-a-nan-result-in-visual-basic-studio/6628/1 "2023-10-12T13:52:10Z")

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I wrote a code in F90, and when I run it using Visual Studio, I get “nan” results, but when I use Microsoft Developer Studio, I get the correct results. why?

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**Author:** ![Arjen](https://avatars.discourse-cdn.com/v4/letter/a/b9bd4f/32.png) [@Arjen](https://fortran-lang.discourse.group/u/Arjen)\
**Post date:** [October 12, 2023, 2:14pm UTC](https://fortran-lang.discourse.group/t/i-got-a-nan-result-in-visual-basic-studio/6628/2 "2023-10-12T14:14:35Z")

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There could be any number of reasons and without some code at least we can only speculate. One possible cause: undefined variables. The two environments could lead to different random values for such variables.