Part of the Fortran WikiBook. The following Fortran code examples or sample programs show different situations depending on the compiler. The first set of 2.5 Options for debugging your program or GNU Fortran. 18. 2.6 Options for directory search .. 19. 2.7 Influencing the linking step. The latest standard is Fortran 2008 (2010): a more minor upgrade compared Fortran standard provides many commonly used functions 99. Outline. A few more words about Fortran built-in data types. Rationale behind derived data types. the context of Fortran 90 and a series of examples and exercises is used to illustrate their use. programming and Fortran 90 to write straightforward programs.Elements of a Fortran Program Unit. Fortran Statements. The Fortran Character Set. Components of Fortran Statements.