isnormal
| 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.
Parameters
| arg | - | floating point value |
Return value
Nonzero integral value if arg is normal, 0 otherwise.
Example
Run this code
#include <stdio.h> #include <math.h> #include <float.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
- 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) |
| (C99) |
checks if the given number has finite value (function) |
| (C99) |
checks if the given number is infinite (function) |
| (C99) |
checks if the given number is NaN (function) |