Editing XL Fortran source files

To create Fortran source programs, you can use any of the available text editors, such as vi or emacs. Source programs must have a suffix of .f unless the fsuffix attribute in the configuration file specifies a different suffix, or the -qsuffix compiler option is used. You can also use a suffix of .F if the program contains C preprocessor (cpp) directives that must be processed before compilation begins. Source files with the .f77, .f90, .f95, .f03, or .f08 suffix are also valid.

For the Fortran source program to be a valid program, it must conform to the language definition that is specified in the XL Fortran Language Reference.