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program complex_31
use, intrinsic :: iso_fortran_env, only: dp => real64
use, intrinsic :: ieee_arithmetic, only: ieee_is_nan
implicit none
complex(dp) :: a, b, c
real(dp) :: tol
tol = 1.0d-12
a = cmplx(1.0d200, 1.0d200, kind=dp)
b = cmplx(1.0d200, 1.0d200, kind=dp)
c = a / b
if (ieee_is_nan(real(c)) .or. ieee_is_nan(aimag(c))) &
error stop "nan in div case 1"
if (abs(real(c) - 1.0d0) > tol) error stop "div case 1 real"
if (abs(aimag(c)) > tol) error stop "div case 1 imag"
a = cmplx(1.0d-200, 1.0d200, kind=dp)
b = cmplx(1.0d-200, 1.0d200, kind=dp)
c = a / b
if (ieee_is_nan(real(c)) .or. ieee_is_nan(aimag(c))) &
error stop "nan in div case 2"
if (abs(real(c) - 1.0d0) > tol) error stop "div case 2 real"
if (abs(aimag(c)) > tol) error stop "div case 2 imag"
print *, "PASS"
end program
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