Hello everyone, I need some help to implement quad precision in gfortran. I have noticed in some discussions that the questions can sometimes be underspecified. If more info is needed, just let me know. I am running an Intel 12th gen Core i9 processor with 64 Gigs of RAM. I installed gfortran and c…

program test ! use iso_fortran_env, wp => real32 ! single !use iso_fortran_env, wp => real64 ! double use iso_fortran_env, wp => real128 ! quad implicit none real(wp),parameter :: pi = acos(-1.0_wp) real(wp) :: bq,cq,dq bq = pi**0.5_wp cq = pi**0.5_wp dq = bq*cq print *, pi print *, dq end p…

Pro tip, I always do something like this: #ifdef REAL32 integer,parameter,public :: wp = real32 !! real kind used by this module [4 bytes] #elif REAL64 integer,parameter,public :: wp = real64 !! real kind used by this module [8 bytes] #elif REAL128 integer,parameter,public :: wp = r…

That was sweet! Thank you. I noticed that you used acos and not acosq as listed in the writeup for libquadmath found in “The GCC Quad-Precision Math LIbrary” on the net. So, I have to believe that I would use, say, exp rather than expq, or cosh rather than coshq. Jacob, this really helps. I started…

Hi @endeavor you might want to consider this page Quickstart tutorial — Fortran Programming Language it has very good learning materials, quick tutorials to get you started in no time :slight_smile: Also, I would suggest that you use in parallel the Compiler Explorer platform as it will enable you …

I have bookmarked both locations. Much appreciated.

[image] endeavor: … Modern fortran is great, but vast. If there is one website that is your favorite for new info, what would it be? … Re: “If there is one website that is your favorite for new info,” that website just might be this Discourse now!

[image] jacobwilliams: … use these … Whoa! No comment like the one here ?!!

[image] endeavor: Modern fortran is great, but vast. If there is one website that is your favorite for new info, what would it be? Most definitely the Fortran website https://fortran-lang.org/ (browse the documentation there) and this Discourse for discussion. You can help us improve it by pr…

Nope. Not a peep from me on that topic. Strange thing though. My editor would not take a close command for a sequential file. It kept treating it like a comment line. Ran the code anyway. Output was just fine. Makes one wonder - what is acually required?

Thanks. Don’t know enough yet to submit improvements, but I will if and when I can.

Gfortran quad precision

Help

FortranFan October 16, 2023, 12:24am 8

Whoa! No comment like the one here?!!

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Gfortran quad precision

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