sf_signif.c

来自「Newlib 嵌入式 C库 标准实现代码」· C语言 代码 · 共 41 行

/* sf_signif.c -- float version of s_signif.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, [e-mail].
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

#include "fdlibm.h"

#ifdef __STDC__
	float significandf(float x)
#else
	float significandf(x)
	float x;
#endif
{
	return __ieee754_scalbf(x,(float) -ilogbf(x));
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
	double significand(double x)
#else
	double significand(x)
	double x;
#endif
{
	return (double) significandf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */