[swift-users] How to print formated "%.9f" Double? Swift 2.2 ?

[Harlan Haskins]

I’m not sure what happened to String(format:), but I haven’t been able to get it to work either.
It’s printing its argument as a tuple.

I think variadic functions aren’t implemented in the dev version of Swift?

main.swift:3:1: error: 'printf' is unavailable: Variadic function is unavailable
printf("%0.2d", 4.555555555)
^~~~~~
SwiftGlibc.printf:2:13: note: 'printf' has been explicitly marked unavailable here
public func printf(__format: UnsafePointer<Int8>, _ varargs: Any...) -> Int32

> On Dec 10, 2015, at 4:39 PM, Isaac Gouy via swift-users <swift-users at swift.org> wrote:
> 
> 
> For example,
> 
>   print( String(format: "%.3f", 1.23489) )
> 
>   $ /usr/local/src/swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu15.10/bin/swiftc test.swift
> 
>   $ ./test
>   ("%.3f", 1.23489)
> 
> Not 1.235
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