?? isnan.c
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/*libc/ieee_float/isnan.cCreated: Oct 14, 1993 by Philip Homburg <philip@cs.vu.nl>Implementation of isnan that directly tests the bits in an ieee float*/#define _MINIX_SOURCE#include <sys/types.h>#include <math.h>#include "ieee_float.h"int isnan(value)double value;{ struct f64 *f64p; int exp; f64p= (struct f64 *)&value; exp= F64_GET_EXP(f64p); if (exp != F64_EXP_MAX) return 0; return F64_GET_MANT_LOW(f64p) != 0 || F64_GET_MANT_HIGH(f64p) != 0;}/* * $PchId: isnan.c,v 1.3 1996/02/22 21:01:39 philip Exp $ */?? 快捷鍵說明
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