4.3BSD - /usr/src/new/B/src/bsmall/B1num.h

   1: /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1984. */
   2: /* $Header: B1num.h,v 1.1 84/06/28 00:48:38 timo Exp $ */
   3: 
   4: /* Definitions for number internals */
   5: 
   6: typedef struct{double p, q;} number;
   7: typedef double integer;
   8: #define Zero ((integer) 0)
   9: #define One ((integer) 1)
  10: #define Two ((integer) 2)
  11: 
  12: #define Checknum(v) if ((v)->type != Num) error("value not a number")
  13: #define Numerator(v) ((integer) ((number *)Ats(v))->p)
  14: #define Denominator(v) ((integer) ((number *)Ats(v))->q)
  15: #define Exact(v) (((number *)Ats(v))->q != Zero)
  16: #define Integral(v) (Exact(v) && (Denominator(v)==One))
  17: #define Approxval(v) (((number *)Ats(v))->p)
  18: #define Numval(v) (Exact(v) ? Numerator(v)/Denominator(v) : Approxval(v))
  19: 
  20: value mk_int();
  21: value mk_approx();
  22: value mk_exact();

Defined typedef's

Defined macros

Usage of this include