1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
! { dg-do run }
!
! I/O test for REAL(16)
!
! Contributed by Dominique d'Humieres
!
program test_qp
use iso_fortran_env, only: real_kinds
implicit none
integer, parameter :: QP = real_kinds(ubound(real_kinds,dim=1))
real(kind=qp) :: a,b(2), c
integer :: exponent, i
character(len=180) :: tmp
! Run this only with libquadmath; assume that all those systems
! have also kind=10.
if (size (real_kinds) >= 4 .and. qp == 16) then
i = 3
if (real_kinds(i) /= 10) stop
exponent = 4000
b(:) = huge (1.0_qp)/10.0_qp**exponent
! print *, 'real(16) big value: ', b(1)
write (tmp, *) b
read (tmp, *) a, c
! print *, 'same value read again: ', a, c
! print *, 'difference: looks OK now ', a-b(1)
if (abs (a-b(1))/a > epsilon(0.0_qp) &
.or. abs (c-b(1))/c > epsilon (0.0_qp)) call abort()
end if
end program test_qp
|
