//: Playground - noun: a place where people can play
import UIKit
let m = 20
let n = 10.5
// let result = m + n 错误写法
// 将Int类型转成Double: Double(标识符)
// 将Double类型转成Int : Int(标识符)
let result1 = Double(m) + n
let result2 = m + Int(n)
let a : Double = 2.44
let b : CGFloat = 3.55
let result = a + Double(b)
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