Mathematical Library Functions                           modf(3M)



NAME
     modf, modff, modfl - decompose floating-point number

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     double modf(double x, double *iptr);


     float modff(float x, float *iptr);


     long double modfl(long double x, long double *iptr);


DESCRIPTION
     These functions break the argument x into integral and frac-
     tional  parts,  each of which has the same sign as the argu-
     ment. It stores the integral part as a double for the modf()
     function, a float for the modff() function, or a long double
     for themodfl() function in the object pointed to by iptr.

RETURN VALUES
     Upon  successful  completion,  these  functions  return  the
     signed fractional part of x.


     If x is NaN, a NaN is returned and *iptr is set to NaN.


     If x is ]Inf, ]0 is returned and *iptr is set to ]Inf.

ERORS
     No errors are defined.

USAGE
     These functions compute the function result and  *iptr  such
     that:

       a = modf(x, &iptr) ;
       x == a]*iptr ;


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:








SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                           modf(3M)



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     frexp(3M), isnan(3M), ldexp(3M), attributes(5), standards(5)












































SunOS 5.11          Last change: 12 Jul 2006                    2