Swift 除余和取整

常规方法

let x = 8.625
print(x / 0.75)
// Prints "11.5"

// 取整
let q = (x / 0.75).rounded(.towardZero)
// q == 11.0

// 除余
let r = x.truncatingRemainder(dividingBy: 0.75)
// r == 0.375

let x1 = 0.75 * q + r
// x1 == 8.625

• truncatingRemainder(dividingBy:)

或者

let number1 = 10
let number2 = 3
let quotient = number1 / number2		// 3
let remainder = number1 % number2		// 1

也可以使用 quotientAndRemainder(dividingBy:)

func quotientAndRemainder(dividingBy rhs: Int) -> (quotient: Int, remainder: Int)

let number1 = 10
let number2 = 3
let answer = number1.quotientAndRemainder(dividingBy: number2)
answer.quotient		// 3
answer.remainder	// 1

是否能整除

let number = 8
if number % 2 == 0 {
    print("这个整数可以被2整除")
} else {
    print("这个整数不能被2整除")
}