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This is a small library for continued fraction calculations, written in C. For more details about continued fractions and the algorithms herein, see http://perl.plover.com/yak/cftalk/ The library is documented in "libcf.3". The Makefile builds a program called "cf-demo" that demonstrates the library. This is fully documented in "demo.1". A brief usage summary follows. cf-demo num den Print the continued fraction expansion of rational number num/den. For example, "cf-demo 29 8" prints "3 1 1 1 2". cf-demo x Print the continued fraction expansion of floating point number x. For example, "cf-demo 1.4142" prints "1 2 2 2 2 2 1 1 29 86 312". cf-demo a b c d x Print the continued fraction expansion of (ax+b)/(cx+d) where a,b,c,d are integers and x is real. cf-demo a b c d e f g h x y Print the continued fraction expansion of (axy+bx+cy+d)/(exy+fx+gy+h) where a..h are integers and x and y are real. cf-demo x + y cf-demo x - y cf-demo x * y cf-demo x / y x and y are first converted to continued fractions, and then the indicated calculation is performed; for example 'x + y' adds x and y. Then the resulting continued fraction is printed. For convenience, 'x' is accepted as a synonym for '*'.