This manual documents the use of gfortran, the GNU Fortran compiler. You can find inthis manual how to invoke gfortran, as well as its features and incompatibilities.The GNU Fortran compiler front end was designed initially as a free replacement for, oralternative to, the unix f95 command; gfortran is the command you'll use to invoke thecompiler.The GNU Fortran compiler is still in an early state of development. It can generate codefor most constructs and expressions, but much work remains to be done.When the GNU Fortran compiler is finished, it will do everything you expect from anydecent compiler. *** Money raised from the sale of this book supports the development of free software and documentation.