快速3循环错误（获取变量并自行添加）

Question

My code does not work right now. I am trying to take names and add it by itself in the loop but the complier is giving me a error message and the code is not being printed.

let names = [Double(2),3,8] as [Any]
let count = names.count
for i in 0..<count {
    print((names[i]) + names[i])
}

Answer 1

Because Any doesn't have + operator.

This will give you the result you expected.

If you want to add 2 values and print the result, you need to cast Any to calculatable like Double

let names = [Double(2),3,8] as [Any]
let count = names.count
for i in 0..<count {
    if let value = names[i] as? Double {
        print(value + value)
    }
}

Answer 2

The use of as [Any] makes no sense. You can't add two objects of type Any which is probably what your error is about.

Simply drop it and your code works.

let names = [Double(2),3,8]
let count = names.count
for i in 0..<count {
    print(names[i] + names[i])
}

Output:

4.0
6.0
16.0

Better yet:

let names = [Double(2),3,8]
for num in names {
    print(num + num)
}