Getting error while trying to convert a string into a large number

Question

I'm getting an error while trying to save a large number which is converted from a string value, I know its larger than CUnsignedLongLong but is there any method to solve this issue?

var strVal = "999999999999999999999"
var n : CUnsignedLongLong = CUnsignedLongLong(strVal)! // Getting error on this line

fatal error: unexpectedly found nil while unwrapping an Optional value

for handling large numeric values , store data into array and create custom method to perform arithmetic , we cant use outside value :i.e - min and max value provided by any data type — Shobhakar Tiwari, Aug 26 '16 at 11:26

score 0 · Answer 1 · answered Aug 26 '16 at 11:21

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You got error because it is out of the bounds of CUnsignedLongLong. Max value of CUnsignedLongLong is 18,446,744,073,709,551,615 and you trying to assign value 999,999,999,999,999,999,999

answered Aug 26 '16 at 11:21

Pavel Gatilov

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Yes, I know that but i need a solution over this issue – Jan Aug 26 '16 at 11:22
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@Jan then you only need to google for bigger data type... – Aug 26 '16 at 11:23
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@Jan anywhere your question was not about this. And you may try that library - https://github.com/githotto/osxgmp – Pavel Gatilov Aug 26 '16 at 11:25
If you don't declare an explicit type, Swift will infer it. @Jan – Aug 26 '16 at 11:26
@PavelGatilov yeah, checked it out and seems to be very good approach – Aug 26 '16 at 11:29

Getting error while trying to convert a string into a large number

1 Answers1