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isnormal

From cppreference.com
< c‎ | numeric‎ | math
 
C
 
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Common mathematical functions
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Basic operations
(C99)
(C99)
(C99)
(C99)
(C99)(C99)(C99)(C23)
Maximum/minimum operations
(C99)
(C99)
(C23)
(C23)
(C23) 
Exponential functions
(C23)
(C99)
(C99)
(C23)
(C23)

(C99)
(C99)(C23)
(C23)
(C23)
Power functions
(C99)
(C23)
(C23)

(C99)
(C23)
(C23)
(C23)
Trigonometric and hyperbolic functions
(C23)
(C23)
(C23)
(C23)
(C99)
(C99)
(C99)
Nearest integer floating-point
(C99)(C99)(C99)
(C23)
(C99)

(C99)
(C99)(C99)(C99)
(C23)(C23)(C23)(C23)
Floating-point manipulation
(C99)(C99)
(C99)(C23)
(C99)
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(C23)
(C23)
(C23)
(C23)
(C23)
(C23)
Quantum and quantum exponent
(C23)
(C23)
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Classification
(C99)
(C23) 
(C99)
(C99)
(C99)
isnormal
(C99)
(C99)
(C23)
(C23)
Error and gamma functions
(C99)
(C99)
(C99)
(C99)
Types
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Special floating-point values
(C99)(C23)
(C99)(C23)
Arguments and return values
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Fast operation indicators
 
Defined in header <math.h>
#define isnormal(arg) /* implementation defined */
 (since C99)

Determines if the given floating-point number arg is normal, i.e. is neither zero, subnormal, infinite, nor NaN. The macro returns an integral value.

FLT_EVAL_METHOD is ignored: even if the argument is evaluated with more range and precision than its type, it is first converted to its semantic type, and the classification is based on that.

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