modf(3C)
NAME
modf, modff - decompose floating-point number
SYNOPSIS
#include <math.h>
double modf(double x, double *iptr);
float modff(float x, float *iptr);
DESCRIPTION
The modf() and modff() functions break the argument x into
integral and fractional parts, each of which has the same
sign as the argument. The modf() function stores the
integral part as a double in the object pointed to by iptr.
The modff() function stores the integral part as a float in
the object pointed to by iptr.
RETURN VALUES
Upon successful completion, modf() and modff() return the
signed fractional part of x.
If x is NaN, NaN is returned and *iptr is set to NaN.
If the correct value would cause underflow to 0.0, modf()
returns 0 and errno may be set to ERANGE.
ERRORS
The modf() function may fail if:
ERANGE
The result underflows.
USAGE
An application wishing to check for error situations should
set errno to 0 before calling modf(). If errno is non-zero
on return, or the return value is NaN, an error has
occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| MT-Level | MT-Safe |
|_____________________________|_____________________________|
SEE ALSO
frexp(3C), isnan(3M), ldexp(3C), attributes(5)
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