#1072: User guide does not explain how to use boolean parameters from Fortran.

Reporter: Ian Hinder Status: new Milestone: Version: Type: bug Priority: minor Component: Cactus

Comment (by Roland Haas):

There is an explanation present since at least git hash [3c44bc84](https://bitbucket.org/cactuscode/cactus/commits/3c44bc840a8f4ecb7b313a4e1e29...) "Fixed numerous spelling errors, some grammatical boo-boos, formatting flaws (inlcuding gratuitous hyphenation and un-dotted 'e.g.' and 'i.e')" of [cactus](https://bitbucket.org/cactuscode/cactus) which is from Mon Jan 5 16:28:24 2004. This is in [doc/UsersGuide/ThornWriters.tex](https://www.einsteintoolkit.org/usersguide/UsersGuide.html#x1-87000C1.6.2) and currently reads:

All parameters defined in a thorn’s param.ccl and all global parameters, appear as local variables of the corresponding CCTK data type in Fortran source code, i.e. **Booleans and Integers appear as CCTK_INT types** (with nonzero/zero values for boolean yes/no), Reals as CCTK_REAL, and Keywords and String parameters as CCTK_STRING (see also note below).

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