What is in Fortran 95 but not in F^TM

F is a trademark of The Fortran Company.

Here is a brief description of what is in Fortran 95, but not in F.

Any F program is also a Fortran 95 program.

An F program does not have:

 o  alternate returns        o  implicit typing
 o  block data               o  labels (one exception)
 o  fixed source form        o  namelist i/o
 o  include                  o  statement functions
 o  external procedures

An F program cannot have the following statements:

 o  common         o  equivalence      o  backward goto
 o  nullify        o  entry            o  sequence
 o  data           o  format           o  do while
 o  attribute statements (e.g., dimension, pointer)
 o  "one-line" if, forall, and while statements

An F program requires that:

• all variables be declared, and that any attributes be specified in the declaration statement
• only entity-oriented declarations are allowed and :: is required
• optional keywords are required in declarations and I/O statements
• all kind values must be given by parameters
• derived types may be defined only in a module or main program
• do and forall variables must be local
• each F procedure must be in a module or be internal to the main program
• modules are restricted to two varieties: public and private, to prevent inadvertant passing of entities through a module
• all variables, types, and procedures declared in a module must have their access attribute (public or private) declared explicitly
• all F functions must not have side effects, except they may do formatted I/O to the terminal
• an open statement must indicate status and action
• in an open statement, some combinataions of the values of the specifiers are prohibited