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module callback_02
contains
subroutine cb(res, a, b, f)
real, intent(in) :: a, b
real :: res
interface
subroutine f(x, res)
implicit none
real, intent(in) :: x
real :: res
end subroutine
end interface
call f(a, res)
print *, res
call f(b, res)
print *, res
res = (b-a)*res
print *, res
end subroutine
real function foo(c, d, res)
real :: c, d, res
call cb(res, c, d, f)
foo = res
contains
subroutine f(x, res)
real, intent(in) :: x
real :: res
res = 2*x
end subroutine f
end function foo
end module
program main
use callback_02
real :: res = 0
res = foo(1.5, 2.0, res)
end program
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