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isnormal

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Determines whether a floating-point value is a normal value.

Syntax

int isnormal(
   /* floating-point */ x
); /* C-only macro */

template <class FloatingType>
inline bool isnormal(
   FloatingType x
) throw(); /* C++-only function template */

Parameters

x
The floating-point value to test.

Return value

isnormal returns a nonzero value (true in C++ code) if the argument x isn't zero, subnormal, infinite, or a NaN. Otherwise, isnormal returns 0 (false in C++ code).

Remarks

isnormal is a macro when compiled as C, and an inline function template when compiled as C++.

Requirements

Function Required header (C) Required header (C++)
isnormal <math.h> <math.h> or <cmath>

For more compatibility information, see Compatibility.

See also

Math and floating-point support
isfinite, _finite, _finitef
isinf
isnan, _isnan, _isnanf
_fpclass, _fpclassf