Instance Property


The number of bits required to represent the value’s significand.



var significandWidth: Int { get }


If this value is a finite nonzero number, significandWidth is the number of fractional bits required to represent the value of significand; otherwise, significandWidth is -1. The value of significandWidth is always -1 or between zero and significandBitCount. For example:

  • For any representable power of two, significandWidth is zero, because significand is 1.0.

  • If x is 10, x.significand is 1.01 in binary, so x.significandWidth is 2.

  • If x is Float.pi, x.significand is 1.10010010000111111011011 in binary, and x.significandWidth is 23.