NOTE: Some Fortran compilers let you read NaN and Infinity from a character string (an extension to F95 but standard in F2003) but don't have the F2003 ieee_arithmetic module. The values you get may differ from the IEEE values (especially NaN). Only one program below uses the IEEE_ARITHMETIC module. It is labelled "with those Fortran 2003 intrinsic modules" because it also uses ISO_FORTRAN_ENV. Programs that involve NaN and Infinity try to read them but continue without them if the reading fails. Reading them may succeed even if calculations like 0.0/0.0 or 1.0/0.0 would fail.

. . The latest version (28 January 2019) of my notes on Fortran 95 for Fortran 77 users. PDF file f95f77.pdf: here
. . Additional index entries for the Fortran 2003 Handbook here
. . Notes on compilers available to SMS and SECS at VUW here
. . Programs illustrating features of Fortran and its compilers
. . . . Combining finite rotations by using quaternions: here
. . . . Printing properties of the various real and integer kinds
. . . . . . without the ISO or IEEE intrinsic modules, kinds.f90: here
. . . . . . with those Fortran 2003 intrinsic modules, kinds03.f90: here
. . . . Showing 19 different uses of * in Fortran 95, test19stars.f: here
. . . . Showing 20 different uses of * in Fortran 2008, test20stars.f: here
. . . . Printing hexcodes for NaN and Infinity without using IEEE modules, testnaninf.f: here
. . Fortran 95/2003 module with test programs to simulate F0.n format with various options
. . . . For compilers supporting exceptional values NaN and Infinity, f0withNaNInf.f90: here
. . . . For compilers not supporting those exceptional values, f0noNaNInf.f90: here
. . Programs that exposed bugs (some now fixed) in some Fortran compilers
. . . . Six unfixed bugs in g95: here
. . . . Two programs using ADVANCE='NO' that different compilers treat differently: here and here
. . . . Using a generic function that has two specific forms, one of which invokes the other: here
. . . . Using a FORALL statement with a character array: here
. . . . Printing an enormous number in F0.0 format: here
. . . . Using a public generic function with specific functions of private types (valid F2003 but bad F95): here
. . . . Printing the value of a public generic function with specific functions of private types: here