difference_of_squares.f90

module difference_of_squares
  implicit none
contains

  integer function square_of_sum(n)
    integer :: n

  end function square_of_sum

  integer function sum_of_squares(n)
    integer :: n

  end function sum_of_squares

  integer function difference(n)
    integer :: n

  end function difference

end module difference_of_squares