Function has no implicit type

Question

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         


        

Answer 1

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.