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

fdim, fdimf, fdiml - compute positive difference between two floating-point numbers

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

floatfdimf(floatx,floaty);

long doublefdiml(long doublex,long doubley);

These functions determine the positive difference between their
arguments. If *x* is greater than *y*, *x*−*y* is
returned. If *x* is less than or equal to *y*, +0 is returned.

Upon successful completion, these functions return the positive difference value.

If *x*−*y* is positive and overflows, a range
error occurs and **fdim()**, **fdimf()**, and **fdiml()** returns
the value of the macro **HUGE_VAL**, **HUGE_VALF**, and
**HUGE_VALL**, respectively.

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

These functions will fail if:

**Range Error**

The result overflows.

If the integer expression (**math_errhandling** &
**MATH_ERREXCEPT**) is non-zero, the overflow floating-point exception
will be 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), fmax(3M), fmin(3M), attributes(7), standards(7)

July 12, 2006 | SunOS 5.11 |