std::frexp

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Common mathematical functions
Functions
Basic operations
remainder (C++11)
remquo (C++11)
fma (C++11)
fmax (C++11)
fmin (C++11)
fdim (C++11)
nan
nanf
nanl
(C++11)
(C++11)
(C++11)
Exponential functions
exp
exp2 (C++11)
expm1 (C++11)
log
log10
log1p (C++11)
log2 (C++11)
Power functions
sqrt
cbrt (C++11)
hypot (C++11)
pow
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sinh
cosh
tanh
asinh (C++11)
acosh (C++11)
atanh (C++11)
Error and gamma functions
erf (C++11)
erfc (C++11)
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tgamma (C++11)
Nearest integer floating point operations
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(C++11)
(C++11)
(C++11)
trunc (C++11)
nearbyint (C++11)
rint
lrint
llrint
(C++11)
(C++11)
(C++11)
Floating point manipulation functions
ldexp
scalbn
scalbln
(C++11)
(C++11)
ilogb (C++11)
logb (C++11)
frexp
modf
nextafter
nexttoward
(C++11)
(C++11)
copysign (C++11)
Classification/Comparison
fpclassify (C++11)
isfinite (C++11)
isinf (C++11)
isnan (C++11)
isnormal (C++11)
signbit (C++11)
isgreater (C++11)
isgreaterequal (C++11)
isless (C++11)
islessequal (C++11)
islessgreater (C++11)
isunordered (C++11)
Macro constants
FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
Defined in header <cmath>
float       frexp( float arg, int* exp );
double      frexp( double arg, int* exp );
long double frexp( long double arg, int* exp );
double      frexp( Integral arg, int* exp );
(since C++11)

Decomposes given floating point value to significand and exponent.

[edit] Parameters

arg - floating point value
exp - pointer to integer value to store the exponent to

[edit] Return value

Significand of the given floating point number in the range of [0.5; 1). The exponent is put into integer value pointed to by exp.

[edit] See also

multiplies a number by 2 raised to a power
(function)
(C++11)
extracts exponent of the number
(function)
(C++11)
extracts exponent of the number
(function)
decomposes a number into integer and fractional parts
(function)