It is a direct N-body integrator, i . Close encounters are not treated specially. A different version of nbody0.f is needed in this case. A C version is also available, as nbody0.c, though the Makefile needs the target nbody00 to install it. The user interface is the same as that of nbody0.
NMAX bytes is needed, for a given max- imum of NMAX particles.
NMAX double precision and 20 . NMAX real storage units for a maximum compiled number of NMAX particles. On most machines this adds up to 160 . NMAX double's are needed, which means 400 .