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源代码在线查看： math.h
/*--------------------------------------------------------------------------
MATH.H
Prototypes for mathematic functions.
Copyright (c) 1988-2001 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/
#pragma SAVE
#pragma REGPARMS
extern char cabs (char val);
extern int abs (int val);
extern long labs (long val);
extern float fabs (float val);
extern float sqrt (float val);
extern float exp (float val);
extern float log (float val);
extern float log10 (float val);
extern float sin (float val);
extern float cos (float val);
extern float tan (float val);
extern float asin (float val);
extern float acos (float val);
extern float atan (float val);
extern float sinh (float val);
extern float cosh (float val);
extern float tanh (float val);
extern float atan2 (float y, float x);
extern float ceil (float val);
extern float floor (float val);
extern float modf (float val, float *n);
extern float fmod (float x, float y);
extern float pow (float x, float y);
#pragma RESTORE
