Convert hex to decimal in swift

Question

how to convert hex to decimal in swift?

I have string "423fdf4dfb1115" and I need get this => 18647576781459733.

I try this:

let result = UInt8(strtoul("423fdf4dfb1115", nil, 16)) 

but app crash...

I use this online convert: http://www.binaryhexconverter.com/hex-to-decimal-converter

Answer 1

The result must be UInt64 (UInt8.max is 255).

There is a convenience initializer, strtoul is not needed.

let string = "423fdf4dfb1115"
let result = UInt64(string, radix:16)

Answer 2

let result = UInt64(strtoul("423fdf4dfb1115", nil, 16))