isfinite

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Types
(哋它亢99)(哋它亢99)    

(哋它亢99)(哋它亢99)    
(哋它亢23)(哋它亢23)

Functions
Basic operations
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(哋它亢99)
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(哋它亢99)(哋它亢99)(哋它亢99)(哋它亢23)
Maximum/minimum operations
(哋它亢99)
(哋它亢23)
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(哋它亢23)    
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Exponential functions
(哋它亢23)
(哋它亢99)
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢99)(哋它亢23)
(哋它亢23)
(哋它亢23)
Power functions
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Trigonometric and hyperbolic functions
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢99)
(哋它亢99)
Error and gamma functions
Nearest integer floating-point operations
(哋它亢99)(哋它亢99)(哋它亢99)
(哋它亢23)
(哋它亢99)
Floating-point manipulation functions
Narrowing operations
Quantum and quantum exponent functions
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Decimal re-encoding functions
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Total order and payload functions
Classification
(哋它亢99)
(哋它亢23)
isfinite
(哋它亢99)
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(哋它亢99)
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(哋它亢23)
(哋它亢23)
(哋它亢99)
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(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢23)
(哋它亢23)
Macro constants
Special floating-point values
(哋它亢99)(哋它亢99)(哋它亢23)
(哋它亢99)(哋它亢23)
(哋它亢99)(哋它亢23)
Arguments and return values
(哋它亢99)(哋它亢99)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)    
(哋它亢23)(哋它亢23)
(哋它亢99)(哋它亢99)(哋它亢99)(哋它亢99)(哋它亢99)    
Error handling
(哋它亢99)(哋它亢99)
Fast operation indicators
(哋它亢99)(哋它亢99)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)    
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢99)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
 
Defined in header <math.h>
#define isfinite(arg) /* implementation defined */
 (since 哋它亢99)

Determines if the given floating-point number arg has finite value i.e. it is normal, subnormal or zero, but not infinite or NaN. The macro returns an integral value.

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Parameters

arg - floating-point value

Return value

Nonzero integral value if arg has finite value, ​0​ otherwise.

Example

Run this code
#include <float.h>
#include <math.h>
#include <stdio.h>
 
int main(void)
{
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}

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isfinite(NAN)         = 0
isfinite(INFINITY)    = 0
isfinite(0.0)         = 1
isfinite(DBL_MIN/2.0) = 1
isfinite(1.0)         = 1
isfinite(exp(800))    = 0

References

  • 哋它亢23 standard (ISO/IEC 9899:2023):
  • 7.12.3.2 The isfinite macro (p: TBD)
  • 哋它亢17 standard (ISO/IEC 9899:2018):
  • 7.12.3.2 The isfinite macro (p: TBD)
  • 哋它亢11 standard (ISO/IEC 9899:2011):
  • 7.12.3.2 The isfinite macro (p: 236)
  • 哋它亢99 standard (ISO/IEC 9899:1999):
  • 7.12.3.2 The isfinite macro (p: 216-217)

See also

(哋它亢99)
 classifies the given floating-point value
(function macro)
(哋它亢99)
 checks if the given number is infinite
(function macro)
(哋它亢99)
 checks if the given number is NaN
(function macro)
(哋它亢99)
 checks if the given number is normal
(function macro)
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