MODF(3M) Mathematical Library Functions MODF(3M)

NAME

modf, modff, modfl - decompose floating-point number

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double modf(double x, double *iptr);


float modff(float x, float *iptr);


long double modfl(long double x, long double *iptr);

DESCRIPTION

These functions break the argument x into integral and fractional
parts, each of which has the same sign as the argument. It stores the
integral part as a double for the modf() function, a float for the
modff() function, or a long double for the modfl() function in the
object pointed to by iptr.

RETURN VALUES

Upon successful completion, these functions return the signed
fractional part of x.


If x is NaN, a NaN is returned and *iptr is set to NaN.


If x is +-Inf, +-0 is returned and *iptr is set to +-Inf.

ERRORS

No errors are defined.

USAGE

These functions compute the function result and *iptr such that:

a = modf(x, &iptr) ;
x == a+*iptr ;

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+

SEE ALSO

frexp(3M), isnan(3M), ldexp(3M), attributes(7), standards(7)

SunOS 5.11 June 20, 2021 MODF(3M)