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

modf, modff, modfl - decompose floating-point number

c99 [flag... ]file...-lm[library... ] #include <math.h>doublemodf(doublex,double *iptr);

floatmodff(floatx,float *iptr);

long doublemodfl(long doublex,long double *iptr);

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*.

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.

No errors are defined.

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

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

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

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | Standard |

MT-Level | MT-Safe |

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

June 20, 2021 | SunOS 5.11 |