(Previously "Fortran 8x" and "Fortran Extended") An extensive enlargement of Fortran 77 . Fortran 90 has derived type s, assumed shape array s, array section s, functions returning arrays, case statement, module subprograms and internal subprograms, optional and keyword subprogram arguments, recursion , and dynamic allocation . It is defined in ISO 1539:1991, soon to be adopted by ANSI .
["Fortran 90 Explained", M. Metcalf et al, Oxford University Press 1990].
(1994-12-16)