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    Command:

    isnormal

    
    
    
    

    SYNOPSIS

           #include <math.h>
    
           int fpclassify(x);
    
           int isfinite(x);
    
           int isnormal(x);
    
           int isnan(x);
    
           int isinf(x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           fpclassify(), isfinite(), isnormal():
               _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           isnan():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           isinf():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           Floating  point  numbers  can  have special values, such as infinite or
           NaN.  With the macro fpclassify(x) you can find out  what  type  x  is.
           The  macro takes any floating-point expression as argument.  The result
           is one of the following values:
    
           FP_NAN        x is "Not a Number".
    
           FP_INFINITE   x is either positive infinity or negative infinity.
    
           FP_ZERO       x is zero.
    
           FP_SUBNORMAL  x is too small to be represented in normalized format.
    
           FP_NORMAL     if nothing of the above is correct then it must be a nor-
                         mal floating-point number.
    
           The other macros provide a short answer to some standard questions.
    
           isfinite(x)   returns a nonzero value if
                         (fpclassify(x) != FP_NAN && fpclassify(x) != FP_INFINITE)
    
           C99, POSIX.1.
    
           For isinf(), the standards merely say that the return value is  nonzero
           if and only if the argument has an infinite value.
    
    
    

    NOTES

           In  glibc  2.01 and earlier, isinf() returns a nonzero value (actually:
           1) if x is positive infinity or negative infinity.  (This is  all  that
           C99 requires.)
    
    
    

    SEE ALSO

           finite(3), INFINITY(3), isgreater(3), signbit(3)
    
                                      2013-08-06                     FPCLASSIFY(3)
    
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