Function has no implicit type

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I am trying to learn to work with functions. I have the following code:

program main
  implicit none

  write(*,*) test(4)
end program

integer function test(n)
  implicit none
  integer, intent(in) :: n
  integer :: i, ans

  ans=1
  do i=1,n
  ans=ans*i
  enddo

  test=ans
end function test

When I compile (with gfortran 4.1.2), I get the following error:

In file test.f90:4

  write(*,*) test(4)
           1
Error: Function 'test' at (1) has no IMPLICIT type

Move the line

end program

to the end of your source file and, in its place, write the line

contains

As you have written your program it has no knowledge of the function test, which is what the compiler is telling you. I have suggested one of the ways in which you can provide the program with the knowledge it needs, but there are others. Since you are a learner I'll leave you to figure out what's going on in detail.

Some common pitfalls in writing Fortran functions · Wu Sun, Ph.D., “Function result … at (1) has no implicit type”. The example below will raises an error of this at the compile-time. function foo(x) result(bar)  > the type for procedure(l_f). > Or I could be completely wrong on this. I would think all the function needs is the "I_f" aspect which is defined in the module itself within the abstract interface.


Just in case, someone has the same problem an alternative way (especially for the case discussed in the comment) is to add

integer,external :: test

after

implicit none

in the main program.

[Fortran 90/95] Error: function has no IMPLICIT type, test8.f95:26.8: BMat = BMatScal(InverseJacobian, ShapeFuncDeriv) 1 Error: Function 'bmatscal' at (1) has no IMPLICIT type. I don't know why it  You need to declare the function as a variable for the compiler to know the return type of the function. Another simple way, not mentioned in the current answers: Move the function before the main program, put module subs, implicit none and contains before the function and end module after the function.


Just put this:

program main
  implicit none

integer test

  write(*,*) test(4)
end program
...

You need to declare the function as a variable for the compiler to know the return type of the function.

gfortran: unexpected 'has no IMPLICIT type' error for a type-bound , Upon compilation, function get_f( this ) result( f_ptr ) 1. Error: Symbol 'get_f' at (1) has no IMPLICIT type. Sign in to reply. 10/13/16 herrman. What’s the type of this value? Previously, it was Transaction => Int, that is, the knowledge that the function has an implicit parameter got lost in the type. The main extension implemented by the pull request is to introduce implicit function types that mirror the implicit function values which we have already. Concretely, the new type of f1 is:


Another simple way, not mentioned in the current answers:

Move the function before the main program, put module subs, implicit none and contains before the function and end module after the function. The put use subs into your program.

This way the program can see everything necessary ("explicit interface") about the procedures in the subs module and will know how to call them correctly. The compiler will be able to provide warnings and error messages if you try to call the procedures incorrectly.

module subs
  implicit none
contains
  integer function test(n)
    !implicit none no longer necessary here
  end function test
end module

program main
  use subs
  implicit none

Function 'cosd' has no implicit type - Fortran, Error: Function 'cosd' at (1) has no implicit type. Here's my code: subroutine dipole_tilt(glong, glat, utsec, tau, day, hgraze) implicit none cosd and sind are not standard implicit functions. They're just functions that have been defined somewhere in your code. You need


has no IMPLICIT type, gfortran Error in network.f90: Function 'gamma' at (1) has no IMPLICIT type #240. Closed. rwest opened this issue on Dec 20, 2011 · 4 comments. Closed  Symbol has no implicit type bug r => testFunc end select return end subroutine testSub double precision function testFunc() implicit none return end function


Andrew Benson, "Symbol has no implicit type" bug testSub double precision function testFunc() implicit none return end function testFunc end module testMod  Hi, I follow the advice of several people concerning a previous question, and decided to switch from fortran 77 to Fortran 90/95. I have on my system gfortran40 which is a part of gcc.


Error : Function f has no implicit type, where f is an overloaded , say that when tried to compile without including implicit none in my functions of interface f it would compile but it would mess the precision levels ). Also, module​  Do not declare the type of the result variable twice. If the result variable type is already declared in the function header, there is no need to declare it again in the function body. This means the following example is wrong.