Converting Hexadecimal number to floating point decimal number

[Fifi]

Thanks McGimpsey, the hex number will appear in a single sell say A1 a
like 0X00 0X0f 0X7b 0Xa1 0x39. What I need is to automatically conver
this hex string into a decimal like 2.4e-5. That is automaticall
stripping off the prefixes and convert each segment of the hex string
Its not just taking a single hex number