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module callback_03
contains
real function cb(f, a, b)
real, intent(in) :: a, b
interface
real function f(x)
implicit none
real, intent(in) :: x
end function
end interface
cb = (b-a) + f(a) + f(b)
end function
subroutine foo1(c, d)
real :: c, d
print *, cb(f, c, d)
contains
real function f(x)
real, intent(in) :: x
f = 2*x
end function f
end subroutine foo1
subroutine foo2(c, d)
real :: c, d
print *, cb(f, c, d)
contains
real function f(x)
real, intent(in) :: x
f = -2*x
end function f
end subroutine foo2
end module
program main
use callback_03
call foo1(1.5, 2.0)
call foo2(1.5, 2.0)
end program main
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