Please suggest me some reading for understanding format in Fortran

My reference is chapter 11 “Edit descriptors” of Modern Fortran Explained: Incorporating Fortran 2018

Fortran Courses in Fortran Wiki is the place to start online, but formatting I/o is a language within a language, and if you have a more specific question do ask.

Here is another online resource: FORMAT Mind you: an explanation of the “words” of this little language is not the same as a “grammar” or an “idiom”. As @NormanKirkby indicated, you may be better off to ask about specific problems that you need to solve.

Here is a program that illustrates some Fortran formats. The output of a print statement is given in comment lines below it. program formats implicit none real :: x(3) = [4.0,9.0,16.0] integer :: v(3) = [4,9,16] print*,x(1) ! * gives list-directed output. It is general and ! can be use…

A good reference I like for Fortran formatting is: Formatted Input and Output by Dr. C.K. Shene. Dr. Shene’s slide deck is linked to by Learn — Fortran Programming Language . [Scroll down to the online courses section, and look for Fortran 90 Tutorial]

Nesting and reuse and repeat are among some of the unique features for Fortran FORMATs partly because Fortran did not initially allow composing a line using non-advancing I/O or internal I/O accept for the long-defunct but once common ENCODE and DECODE statements. The basic descriptors are not that…

Shene’s ‘Formatted Input and Output’ is somewhat out of date. It does not mention w=0 in Fw.d output (standard since F2003) or E, ES, EN, or Gw.d output (standard since F2018). In addition it says that in E, ES, or EN format output there will always be an E in what is written. But according to the …

No, that is not conforming. See Interp F18/033 . Intel has not picked up on this yet. (NAG hasn’t either.) The interp edits are part of F2023 and a Corrigendum to F2018.

@sblionel is right. Always including E in Dw.d, Ew.d, ESw.d, or ENw.d output if w = 0 is one of the few topics on which “Modern Fortran Explained” misleads. See F2023 Tables 13.1, 13.2, and 13.3. But if w > 0 and the decimal exponent needs three digits then the E must still be omitted from the out…

I would not say “misleads” - as the interp says, F2018 and earlier did not reflect the intent of w=0, and also failed to establish an interpretation when Ee is omitted, and the exponent is more than three digits. Compare to the same tables in F2018. What I find interesting is that nobody raised thi…

In F2008 Tables 10.1, 10.2 and 10.3 suggest that E, D, EN and ES formats must not omit Ee if |exp| > 999. Some compilers already offered real types needing four digits. So could part of the F2018 interp have been an interp to F2008 ?

Format sentence of Fortran

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ivanpribec December 26, 2024, 2:07pm 16

I think your reply belongs in the other thread: Omission in the Fortran 2023 Standard? - #11 by ClivePage.

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Format sentence of Fortran

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