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Defined in header <math.h> | ||
#define isnormal(arg) /* implementation defined */ | (since C99) | |
Determines if the given floating-point numberarg is normal, i.e. is neither zero, subnormal, infinite, norNaN
. 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.
Contents |
arg | - | floating-point value |
Nonzero integral value ifarg is normal,0 otherwise.
#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) = 0isnormal(INFINITY) = 0isnormal(0.0) = 0isnormal(DBL_MIN/2.0) = 0isnormal(1.0) = 1
(C99) | classifies the given floating-point value (function macro)[edit] |
(C99) | checks if the given number has finite value (function macro)[edit] |
(C99) | checks if the given number is infinite (function macro)[edit] |
(C99) | checks if the given number is NaN (function macro)[edit] |
C++ documentation forisnormal |