# Complex addition returns NaN

**URL:** <https://fortran-lang.discourse.group/t/complex-addition-returns-nan/204>\
**Category:** Help\
**Created:** [July 12, 2020, 3:19pm UTC](https://fortran-lang.discourse.group/t/complex-addition-returns-nan/204 "2020-07-12T15:19:26Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![certik](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/certik/32/4_2.png) [@certik](https://fortran-lang.discourse.group/u/certik)\
**Post date:** [July 13, 2020, 2:08pm UTC](https://fortran-lang.discourse.group/t/complex-addition-returns-nan/204/8 "2020-07-13T14:08:35Z")

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> @FortranFan, perhaps, you should familiarize yourself with the gfortran manual.

@kargl, please don’t say such things in this forum, because it can be seen as disrespectful (we have a Code of Conduct at this forum: [Welcome to Discourse](https://fortran-lang.discourse.group/t/welcome-to-discourse/7)) and it assumes that @FortranFan fan is not familiar with the GFortran manual, which is an incorrect assumption (@FortranFan is very much familiar with the GFortran manual), but even if that was correct, you can say the same thing respectfully, for example you can say something like:

“@FortranFan, I think this is explained in the GFortran manual, in particular you can try adding the `-Wall` option. …”

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