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fpclassify

Defined in header <math.h> 
#define fpclassify(arg) /* implementation defined */
-		 (since C99)

Categorizes floating point value arg into the following categories: zero, subnormal, normal, infinite, NAN, or implementation-defined category. 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: a normal long double value might become subnormal when converted to double and zero when converted to float.

-

Parameters

- -
arg - floating point value

Return value

One of FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO or implementation-defined type, specifying the category of arg.

-

Example

#include <stdio.h>
-#include <math.h>
-#include <float.h>
- 
-const char *show_classification(double x) {
-    switch(fpclassify(x)) {
-        case FP_INFINITE:  return "Inf";
-        case FP_NAN:       return "NaN";
-        case FP_NORMAL:    return "normal";
-        case FP_SUBNORMAL: return "subnormal";
-        case FP_ZERO:      return "zero";
-        default:           return "unknown";
-    }
-}
-int main(void)
-{
-    printf("1.0/0.0 is %s\n", show_classification(1/0.0));
-    printf("0.0/0.0 is %s\n", show_classification(0.0/0.0));
-    printf("DBL_MIN/2 is %s\n", show_classification(DBL_MIN/2));
-    printf("-0.0 is %s\n", show_classification(-0.0));
-    printf("1.0 is %s\n", show_classification(1.0));
-}

Output:

-
1.0/0.0 is Inf
-0.0/0.0 is NaN
-DBL_MIN/2 is subnormal
--0.0 is zero
-1.0 is normal

References

See also

- - - - -
-
(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)
-
(C99)
 checks if the given number is normal
(function macro)
C++ documentation for fpclassify
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/math/fpclassify -

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