C浮点数0x1.fp3

Question

From an article:

"GNU CC recognizes floating-point numbers written not only in the usual decimal notation, such as 1.55e1, but also numbers such as 0x1.fp3 written in hexadecimal format . In that format the 0x hex introducer and the p or P exponent field are mandatory. The exponent is a decimal number that indicates the power of 2 by which the significand part will be multiplied. Thus 0x1.f is 1 15/16, p3 multiplies it by 8 , and the value of 0x1.fp3 is the same as 1.55e1. "

It seems to say 0x1.fp3 is evaluated as = (1 + 15/16 ) * 2^3

Where the 15/16 came from ?

Answer 1

由于它是十六进制格式，然后0.1意味着1/16 ， 0.2意味着2/16 ，... 0.a意味着10/16 ，...， 0.f意味着15/16 。