In Fortran, by default the type of variables whose names start with
REAL otherwise. It is a legacy of the past and it is know strongly advised to put an
implicit none statement in your program and in each module. That statement was added in the Fortran 90 standard.
Be conscious that if you put an
implicit none at the top of a module, it will apply to the procedures in the
contains section of the module, but not to the
module example implicit none interface integer function one(i) ! Here i will be implicitly an INTEGER, except if you add an implicit none here end function end interface contains integer function two(j) ! The compiler will detect an error because j is not declared end function jfun end module example