double double

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 October 1, 2001, 15:50 double double #1 Damir Guest   Posts: n/a How can one make "double" two times longer (more accurate) in C++ in fast way?

 October 1, 2001, 15:57 Re: double trouble #2 johnny Guest   Posts: n/a do you mean quad. precision?

 October 1, 2001, 16:39 Re: double trouble #3 Damir Guest   Posts: n/a Yes. I mean quad. precision.

 October 1, 2001, 19:14 Re: double trouble #4 johnny Guest   Posts: n/a Sorry, I try and stay away from quad precision :P I heard mathmatica can do quad precision fairly easily. Anyway, I did a web search and get tons of references to c++ "precision" libraries. Here's a link to one which looks good to me http://www.nersc.gov/~dhbailey/mpdist/mpdist.html Cheers

 October 1, 2001, 19:40 Re: double double #5 Axel Rohde Guest   Posts: n/a I don't know about C++, but 'double precision' in modern programming languages (e.g. Visual Basic) implies 64-bit, which is known in assembly as a 'quad word' (4*16-bit). The older Fortran codes, such as Plot3D, only use 32-bit precision ('double word') for floating point numbers. So 'double double precision' in Fortran may be equivalent to 'double precision' in C++.

 October 1, 2001, 22:47 Re: double trouble #6 Damir Guest   Posts: n/a Many thanks.

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