_finite, _finitel

Remonter à float.h - Index

Header File

float.h

Category

Math Routines

Prototype

int _finite(double d);

int _finitel(long double ld);

Description

Determines whether a given double-precision floating point value d is finite.

_finitel is the long double version; it takes a long double argument.

Return Value

Returns non-zero if the argument is finite, and 0 if it is not.

Example

#include <float.h>
#include <stdio.h>

/* Compare a and b if both have finite values */
int compare(double a, double b)
{
  /* Only if both are finite. Otherwise give an indefinite ordering */
  if (_finite(a) && _finite(b)) {
    if (a < b)
      return -1;
    else if (a > b)
      return 1;
    else
      return 0;
  }
  else
    return -1;
}

Portability

	POSIX	Win32	ANSI C	ANSI C++
_finite		+
_finitel		+