Converting Double Type to String Type results in e-

Hello. Excuse me for asking you a question.

If the value is a number that follows "0" such as 0.00 when converting Double to String type, then
It will be a floating-point notation like "e-".
Does anyone know how to avoid this...

import Foundation

leta = 0.138274823423
letb = 0.000021312312

let at = String(a)
let bt = String(b)

print(at)//0.138274823423
print(bt)//2.1312312e-05

I thought I could use NumberFormatter, so I tried the following, but it didn't work.

let formatter=NumberFormatter()
formatter.numberStyle=.decimal

letans=formatter.string (from:NSNumber(value:b))

print(ans!)//0

swift

2022-09-30 21:27

2 Answers

You can also use String(format:) as in self-answer, but you can do the same with NumberFormatter.

let formatter=NumberFormatter()
formatter.numberStyle=.decimal
// Specify the number of digits here
formatter.minimumFractionDigits = 8

letans=formatter.string (from:bas NSNumber)

print(ans!)//->0.00002131

Conversion with String(format:) does not take localization into consideration, so

Not a string to show to users
No need for foreign languages in the future

You should limit your use only when you say that

Apple's class reference is not very easy to use because there are still few descriptions and few examples of code, but I'll show you just in case.
NumberFormatter
minimumFractionDigits

2022-09-30 21:27

I'm sorry.It's self-solving. > People <

letb=0.000021318312
// Specify the number of digits here
letans=String (format: "%.8f", b)

print(ans) // 0.00002132

Please refer to the following

String Format Apple Reference

2022-09-30 21:27

If you have any answers or tips

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