Can't convert and use string value in Double - Swift

Question

I have a easy problem but I can't fix it. In my program There are lines where I have a for loop with custom array. This array has got 3 value each of them string(array created by the JSON object from web). Whenever I tried the reach these string variables in double form I can't as pictures show.

As you can see in the pictures my aim is get he latitude and longitude values turn into double and use in CLLocationCoordinate2D init. but the conversion of string value is for latitude = 35.32041000000002 how can I convert it into presicion 6 digit. Thanks all. Have a nice day.

score 0 · Accepted Answer · answered Oct 25 '18 at 23:05

0

Read this to understand floating point numbers. In summary: Not all numbers can be exactly represented in the 64-bits of a Double. So you'll end up with something that extremely close, but with extra digit(s), or for example with a long tail of 9999999999.

The conversion succeeded. The value that the extra digit (0.000000000000002) won't hurt as they are rather insignificant.

answered Oct 25 '18 at 23:05

meaning-matters

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They hurts because I can't use them in CLLocationCoordinate2D method... – Mertalp Tasdelen Oct 25 '18 at 23:09
Because in init method latitude and longitude values gets the double with precision 6 digit but my variables have many more – Mertalp Tasdelen Oct 25 '18 at 23:11
Your issue seems to be that you don't understand floating point numbers. Your program has no issue. – meaning-matters Oct 25 '18 at 23:15
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Thanks for help. I will read more documentation. – Mertalp Tasdelen Oct 25 '18 at 23:17
Good luck man. I'm sure that if you read a bit more you'll get it; it's pretty simple. We've all been there; new concepts can be very confusing in the beginning. – meaning-matters Oct 25 '18 at 23:18
Have a nice day sir. – Mertalp Tasdelen Oct 25 '18 at 23:19

Can't convert and use string value in Double - Swift

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