Swift基础

题记

最近在用Swift刷LeetCode,顺便熟悉一下Swift基本语法.故以此文已记之.

• 1.基本数据类型转

    var a:Int = 10
    var b = Double(a)
    var str = String(a)
    print(b,str)

• 2.For循环
  • 2.1 带下标

      for i in 0..<100{
        print(i)
      }
    

  • 2.2 不带下标

     for _ in 0..<100{
        print("hello")  
      }
    

• 3.字符串遍历

    /// LeetCode 第9题(回文数)
    /// - Parameter x: 入参
    func isPalindrome(_ x: Int) -> Bool {
        if(x<0) {
          return false
        }
        let str = String(x)
        let length = str.count
        for offset in 0..<length/2{
            let preChar = str[str.index(str.startIndex, offsetBy: offset)]
            let subCHar = str[str.index(str.startIndex, offsetBy: length-1-offset)]
            if(preChar != subCHar){
                return false
            }
        }
        return true
    }