Long Double

Article
04/28/2015

Previous 16-bit versions of Microsoft C/C++ and Microsoft Visual C++ supported the long double, 80-bit precision data type. In Win32 programming, however, the long double data type maps to the double, 64-bit precision data type. The Microsoft run-time library provides long double versions of the math functions only for backward compatibility. The long double function prototypes are identical to the prototypes for their double counterparts, except that the longdouble data type replaces the double data type. The long double versions of these functions should not be used in new code.

Double Functions and Their Long Double Counterparts

Function	Long double counterpart	Function	Long double counterpart
acos	acosl	frexp	frexpl
asin	asinl	_hypot	_hypotl
atan	atanl	ldexp	ldexpl
atan2	atan2l	log	logl
atof	_atold	log10	log10l
Bessel functions j0, j1, jn	j0l, j1l, jnl	_matherr	_matherrl
Bessel functions y0, y1, yn	y0l, y1l, ynl	modf	modfl
_cabs	_cabsl	pow	powl
ceil	ceill	sin	sinl
cos	cosl	sinh	sinhl
cosh	coshl	sqrt	sqrtl
exp	expl	strtod	_strtold
fabs	fabsl	tan	tanl
floor	floorl	tanh	tanhl
fmod	fmodl

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Long Double

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