Проект OpenNet: MAN fdim (3) Библиотечные вызовы (FreeBSD и Linux)

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fdim (3)

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fdim (3) ( Linux man: Библиотечные вызовы )

fdim (3) ( POSIX man: Библиотечные вызовы )

NAME

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

SYNOPSIS

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

double fdim(double x, double y);

float fdimf(float x, float y);

long double fdiml(long double x, long double y);

DESCRIPTION

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.

RETURN VALUES

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.

ERRORS

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.

USAGE

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.