round a number to the nearest thousandth in swift

In Swift, you can use the round() function from the Foundation library to round a number to the nearest thousandth. Here's an example:

main.swift
import Foundation

let number: Float = 3.1415927
let roundedNumber = round(number * 1000) / 1000
print(roundedNumber) // 3.142
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In this example, we multiply the number by 1000 to get the three decimal places, use the round() function to round it to the nearest integer, and then divide by 1000 to get the decimal number back.