Question

我需要类似的东西

var a = 1
var b = 2
var c = a + b should be 12 (Int) instead of 3.

var a = 12
var b = 34
var c = a + b should be 1234 (Int) instead of 46.

我不知道我们怎么能做到这一点？

一种方法是将两个Int都转换为String，然后再次将String转换为Int，然后再对其进行隐蔽，但是我认为这样做并不高效。

如果有解决方案，请先谢谢您。

Answer 1

12 + 34 = 12 * 10 ^ 2 + 34 = 1200 + 34 = 1234

func logC(val: Double, forBase base: Double) -> Double {
    return log(val)/log(base)
}

var a = 10
var b = 0
let x = b == 10 ? 2 : b == 0 ? 1 : ceil(logC(val: Double(b), forBase: 10))
var c = Int(Double(a) * pow(10, x) + Double(b))
print(c)

Answer 2

您可以这样写：

extension Int {
    func concatenateDecimalDigits(in other: Int) -> Int {
        let scale: Int
        switch other {
        case 0...9:
            scale = 10
        case 10...99:
            scale = 100
        case 100...999:
            scale = 1000
        case 1000...9999:
            scale = 10000
        case 10000...99999:
            scale = 100000
        case 100000...999999:
            scale = 1000000
        //You need to add more cases if you need...
        //...
            //...
        default:
            scale = 0   //ignore invalid values
        }
        return self * scale + other
    }
}
var a = 1
var b = 2
print( a.concatenateDecimalDigits(in: b) ) //->12
a = 12
b = 34
print( a.concatenateDecimalDigits(in: b) ) //->1234
a = 122344
b = 9022
print( a.concatenateDecimalDigits(in: b) ) //->1223449022

您可以编写一些逻辑来计算scale，而无需switch，但这并没有太大区别。

Answer 3

任意两个Int的常规解决方案：

您需要计算位数以计算乘数：

func numberOfDigits(_ num: Int) -> Int {
    var count = 0
    var number = num
    while number > 0 {
        number = number / 10
        count += 1
    }
    return count
}

用作：

    let a = 11
    let b = 24

    let noOfDigit = numberOfDigits(b)
    let multiplier = pow(Double(10), Double(noOfDigit))
    let c = a * Int(multiplier) + b
    print(c)

并且，在一行中为：

    let c = a * Int(pow(Double(10), Double(numberOfDigits(b)))) + b

Answer 4

您可以通过以下简单的转换来做到这一点：

version: "3.3"
services:
  test-backend:
    image: test-002
    container_name: test-002
    restart: always
    volumes:
     - ./assets:/opt/test_files
     - ./medialibrary:/opt/test_medialibrary
     - ./app-configs:/opt/test_configs
     - ./logs/backend:/opt/test-backend-logs
    extra_hosts:
     test-converter: "127.0.0.1"
    ports:
     - "8000:8000"
volumes:
  test-data:
  test-data2:

在Swift中像String那样连接Int吗？

4 个答案: