isnormal
From cppreference.com
| Defined in header <math.h>
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#define isnormal(arg) /* implementation defined */
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(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.
Parameters
| arg | - | floating-point value |
Return value
Nonzero integral value if arg is normal, 0 otherwise.
Example
Run this code
#include <float.h>
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("isnormal(NAN) = %d\n", isnormal(NAN));
printf("isnormal(INFINITY) = %d\n", isnormal(INFINITY));
printf("isnormal(0.0) = %d\n", isnormal(0.0));
printf("isnormal(DBL_MIN/2.0) = %d\n", isnormal(DBL_MIN / 2.0));
printf("isnormal(1.0) = %d\n", isnormal(1.0));
}
Output:
isnormal(NAN) = 0
isnormal(INFINITY) = 0
isnormal(0.0) = 0
isnormal(DBL_MIN/2.0) = 0
isnormal(1.0) = 1
References
- C23 standard (ISO/IEC 9899:2024):
- 7.12.3.5 The isnormal macro (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.12.3.5 The isnormal macro (p: TBD)
- C11 standard (ISO/IEC 9899:2011):
- 7.12.3.5 The isnormal macro (p: 237)
- C99 standard (ISO/IEC 9899:1999):
- 7.12.3.5 The isnormal macro (p: 217-218)
See also
(C99) |
classifies the given floating-point value (function macro) |
(C99) |
checks if the given number has finite value (function macro) |
(C99) |
checks if the given number is infinite (function macro) |
(C99) |
checks if the given number is NaN (function macro) |
C++ documentation for isnormal
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