_finite, _finitef

Article
06/05/2017

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The latest version of this topic can be found at _finite, _finitef.

Determines whether a floating-point value is finite.

Syntax

int _finite(   
   double x   
);  
  
int _finitef(   
   float x   
); /* x64 and ARM/ARM64 only */

Parameters

x
The floating-point value to test.

Return Value

Both _finite and _finitef return a nonzero value if the argument x is finite; that is, if –INF < x < +INF. It returns 0 if the argument is infinite or a NAN.

Remarks

The _finite and _finitef functions are Microsoft specific. The _finitef function is only available when compiled for x86, ARM, or ARM64 platforms.

Requirements

Function	Required header (C)	Required header (C++)
`_finite`	<float.h> or <math.h>	<float.h>, <math.h>, <cfloat>, or <cmath>
`_finitef`	<math.h>	<math.h> or <cmath>

For more compatibility information, see Compatibility.

.NET Framework Equivalent

System::Double::IsInfinity

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