HELLO is a FORTRAN77 program which says "Hello, world!".
If you're just trying to learn FORTRAN77, or learning how to use FORTRAN77 on a different computer system, or in batch mode, it's helpful if you start with a very simple program with a tiny amount of output that should print immediately if things are working well.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
HELLO is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a Java version and a MATLAB version and a Python version and an R version.
HELLO_MPI, a FORTRAN77 program which prints out "Hello, world!" using the MPI parallel programming environment.
HELLO_OPENMP, a FORTRAN77 program which prints out "Hello, world!" using the OpenMP parallel programming environment.
You can go up one level to the FORTRAN77 source code page.