The KCalc Handbook
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# A.2. How to enable long double precision for KCalc

If your machine supports the C data type long double and if you have a working libc you can enable long double precison for KCalc.

Here is what to do:

1. Check `../config.h` and see whether HAVE_LONG_DOUBLE is defined, i.e. you should be able to locate a line saying:

        #define HAVE_LONG_DOUBLE 1

   If you can't find such a line your system doesn't support long double IEEE precision.

2. Edit the file `kcalctype.h` `configdlg.cpp` `kcalc.cpp` and `kcalc_core.cpp` and remove the lines:

        #ifdef HAVE_LONG_DOUBLE
        #undef HAVE_LONG_DOUBLE
        #endif

3. Recompile KCalc.

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