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Swiftで有効桁数

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Swiftで有効桁数を表現するにはどうすればいいのだろう?と調べたのでメモ

import UIKit
let a = 3.000
let b = 2.000
let c = Double(a)/Double(b)
let d = String(format: "%.3f", c)
print(c,d)
=> 1.5 1.500

他にも方法はあると思います。ぜひコメントしてください。

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