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Long Double

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 long double 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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