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      isnormal

      From cppreference.com
      <c‎ |numeric‎ |math
       
       
       
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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

      [edit]Parameters

      arg - floating-point value

      [edit]Return value

      Nonzero integral value ifarg is normal,0 otherwise.

      [edit]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)         = 0isnormal(INFINITY)    = 0isnormal(0.0)         = 0isnormal(DBL_MIN/2.0) = 0isnormal(1.0)         = 1

      [edit]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)

      [edit]See also

      classifies the given floating-point value
      (function macro)[edit]
      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
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=c/numeric/math/isnormal&oldid=172037"

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