[Mathematics] a fractional number n/d, where n and d are
integers, n is the numerator and d is the denominator. The
set of all rational numbers is usually called Q.
Computers do not usually deal with rational numbers but
instead convert them to real numbers which are represented
(approximately in some cases) as floating-point numbers.
A translator from Ratfor to Fortran IV was posted to
comp.sources.Unix volume 13.
["Ratfor - A Preprocessor for a Rational Fortran",
B.W. Kernighan, Soft Prac & Exp 5:395-406, Oct 1975].
["Software Tools", B.W. Kernighan & P.J. Plauger, A-W, 1976].