Swift_聲明變量var、常量let

//TODO:打印
    func prin(){
        
        print("hello work")
        print("sub = \(sub)")

    }
    
    
    //TODO:聲明變量、常量
    func verLet(){
        
        //let 常量修飾符
        let a = 10    //整型
        let b = 11.2  //浮點
        let c = true  //布爾
        let d = String(a) + "test"  //字符串
        var e = ["d","aa"]
        var dic = ["a":"1","b":"e"]
        dic["d"] = "d"
        
        //ver 變量修飾符
        var f = 10
        f = 11
        var g = e
        g[0] = "sd"
        
        
        
        
    }