float.h

tc3.0,turbo c开发平台（turb0 c 3.0）kaifapingtai

/*	float.h

	Defines implementation specific macros for dealing with
	floating point.

        Copyright (c) Borland International 1987,1988,1990
	All Rights Reserved.
*/

#ifndef __FLOAT_H
#define __FLOAT_H

#if __STDC__
#define _Cdecl
#else
#define _Cdecl  cdecl
#endif

#ifndef __PAS__
#define _CType  _Cdecl
#else
#define _CType  pascal
#endif

#define FLT_RADIX			2
#define FLT_ROUNDS			1
#define FLT_GUARD			1
#define FLT_NORMALIZE		1

#define DBL_DIG				15
#define FLT_DIG				6
#define LDBL_DIG			19

#define DBL_MANT_DIG		53
#define FLT_MANT_DIG		24
#define LDBL_MANT_DIG		64

#define DBL_EPSILON			2.2204460492503131E-16
#define FLT_EPSILON			1.19209290E-07F
#define LDBL_EPSILON		1.084202172485504E-19

/* smallest positive IEEE normal numbers */
#define DBL_MIN				2.2250738585072014E-308
#define FLT_MIN				1.17549435E-38F
#define LDBL_MIN			_tiny_ldble

#define DBL_MAX			    _huge_dble
#define FLT_MAX			    _huge_flt
#define LDBL_MAX			_huge_ldble

#define DBL_MAX_EXP			+1024
#define FLT_MAX_EXP			+128
#define LDBL_MAX_EXP		+16384

#define DBL_MAX_10_EXP		+308
#define FLT_MAX_10_EXP		+38
#define LDBL_MAX_10_EXP		+4932

#define DBL_MIN_10_EXP		-307
#define FLT_MIN_10_EXP		-37
#define LDBL_MIN_10_EXP		-4931

#define DBL_MIN_EXP			-1021
#define FLT_MIN_EXP			-125
#define LDBL_MIN_EXP		-16381

extern float        _Cdecl _huge_flt;
extern double       _Cdecl _huge_dble;
extern long double  _Cdecl _huge_ldble;
extern long double  _Cdecl _tiny_ldble;

#ifdef __cplusplus
extern "C" {
#endif
unsigned int _Cdecl _clear87(void);
unsigned int _Cdecl _control87(unsigned int __newcw, unsigned int __mask);
void	     _Cdecl _fpreset(void);
unsigned int _Cdecl _status87(void);
#ifdef __cplusplus
}
#endif

#if !__STDC__

/* 8087/80287 Status Word format   */

#define SW_INVALID		0x0001	/* Invalid operation		    */
#define SW_DENORMAL		0x0002	/* Denormalized operand		    */
#define SW_ZERODIVIDE	0x0004	/* Zero divide		    	    */
#define SW_OVERFLOW		0x0008	/* Overflow			            */
#define SW_UNDERFLOW	0x0010	/* Underflow			        */
#define SW_INEXACT		0x0020	/* Precision (Inexact result)	*/

/* 8087/80287 Control Word format */

#define MCW_EM       		0x003f	/* interrupt Exception Masks*/
#define	    EM_INVALID		0x0001	/*   invalid	    		*/
#define	    EM_DENORMAL		0x0002	/*   denormal		    	*/
#define	    EM_ZERODIVIDE	0x0004	/*   zero divide		    */
#define	    EM_OVERFLOW		0x0008	/*   overflow   			*/
#define	    EM_UNDERFLOW	0x0010	/*   underflow	    		*/
#define	    EM_INEXACT		0x0020	/*   inexact (precision)	*/

#define MCW_IC			    0x1000	/* Infinity Control	*/
#define	    IC_AFFINE		0x1000	/*   affine			*/
#define	    IC_PROJECTIVE	0x0000	/*   projective		*/

#define MCW_RC			0x0c00	/* Rounding Control		*/
#define	    RC_CHOP		0x0c00	/*   chop			    */
#define	    RC_UP		0x0800	/*   up				    */
#define	    RC_DOWN		0x0400	/*   down			    */
#define	    RC_NEAR		0x0000	/*   near			    */

#define MCW_PC			0x0300	/* Precision Control	*/
#define	    PC_24		0x0000	/*    24 bits			*/
#define	    PC_53		0x0200	/*    53 bits			*/
#define	    PC_64		0x0300	/*    64 bits			*/

/* 8087/80287 Initial Control Word */
/* use affine infinity, mask underflow and precision exceptions */

#define CW_DEFAULT	_default87
extern unsigned int _Cdecl _default87;

/* 
	SIGFPE signal error types (for integer & float exceptions). 
*/
#define	FPE_INTOVFLOW		126	/* 80x86 Interrupt on overflow	*/
#define	FPE_INTDIV0		    127	/* 80x86 Integer divide by zero	*/

#define	FPE_INVALID		    129	/* 80x87 invalid operation  	*/
#define	FPE_ZERODIVIDE		131	/* 80x87 divide by zero		    */
#define	FPE_OVERFLOW		132	/* 80x87 arithmetic overflow	*/
#define	FPE_UNDERFLOW		133	/* 80x87 arithmetic underflow	*/
#define	FPE_INEXACT		    134	/* 80x87 precision loss	    	*/
#define	FPE_STACKFAULT		135	/* 80x87 stack overflow		    */
#define	FPE_EXPLICITGEN	    140	/* When SIGFPE is raise()'d	    */

/* 
			SIGSEGV signal error types.
*/
#define	SEGV_BOUND		    10	/* A BOUND violation (SIGSEGV)	*/
#define	SEGV_EXPLICITGEN	11	/* When SIGSEGV is raise()'d	*/

/* 
			SIGILL signal error types.
*/
#define	ILL_EXECUTION		20	/* Illegal operation exception	*/
#define	ILL_EXPLICITGEN		21	/* When SIGILL is raise()'d	    */

#endif  /* !__STDC__ */

#endif