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

fmod, fmodf, fmodl - floating-point remainder value function

c99 [flag... ]file...-lm[library... ] #include <math.h>doublefmod(doublex,doubley);

floatfmodf(floatx,floaty);

long doublefmodl(long doublex,long doubley);

These functions return the floating-point remainder of the
division of *x* by *y*.

These functions return the value *x* − *i* *
*y*, for some integer *i* such that, if *y* is non-zero, the
result has the same sign as *x* and magnitude less than the magnitude
of *y*.

If *x* or *y* is NaN, a NaN is returned.

If *y* is 0, a domain error occurs and a NaN is returned.

If *x* is infinite, a domain error occurs and a NaN is
returned.

If *x* is ±0 and *y* is not 0, ±0 is
returned.

If *x* is not infinite and *y* is ±Inf, *x*
is returned.

These functions will fail if:

**Domain Error**

The *x* argument is infinite or *y* is 0.

If the integer expression (**math_errhandling** &
**MATH_ERREXCEPT**) is non-zero, the invalid floating-point exception is
raised.

An application wanting to check for exceptions should call
**feclearexcept**(**FE_ALL_EXCEPT**) before calling these functions.
On return, if **fetestexcept**(**FE_INVALID** | **FE_DIVBYZERO** |
**FE_OVERFLOW** | **FE_UNDERFLOW**) is non-zero, an exception has been
raised. An application should either examine the return value or check the
floating point exception flags to detect exceptions.

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

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | Standard |

MT-Level | MT-Safe |

math.h(3HEAD), feclearexcept(3M), fetestexcept(3M), isnan(3M), attributes(7), standards(7)

July 12, 2006 | SunOS 5.11 |