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

Why are you casting the result to an UInt8? You've got a very large number there, it couldn't possibly fit in a tiny UInt8. — Piepants
– Piepants, Commented Jun 14, 2016 at 20:08
the HEX number you provided (423fdf4dfb1115) is 18,596,864,257,291,000. I proved this in excel (cell x 16^0 )and increment one additional for each digit AND summing the results for each. — Stevan
– Stevan, Commented May 1, 2017 at 14:12

vadian · Accepted Answer · 2016-06-14 20:13:53Z

10

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)

edited Jun 14, 2016 at 20:13

answered Jun 14, 2016 at 20:10

vadian

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2 Comments

Duncan C Over a year ago

Cool trick. I did not know about that initializer. Will it take ANY valid radix? (Base 37, even, if for some strange reason you wanted that?) And is there a corresponding method that outputs the value of an integer class as a string in a given radix?

vadian Over a year ago

@DuncanC I think so. Yes, String has similar initializers for example print(String(999_999, radix: 16)) // "f423f". There is even an optional uppercase parameter to get F423F.

haitham · Accepted Answer · 2018-11-02 19:03:57Z

2

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

edited Nov 2, 2018 at 19:03

answered Jun 14, 2016 at 20:08

haitham

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