编辑代码

let lengthOfTelephoneNumber = 8
let lengthOfldentityCardNumber = 18
let lengthOfZipNumber = 6
var totalvisits = 2000000
var numberOfMembers = 10000
var currentspeed = 120
var a_b = "a and b", aPerson = "one person" let hello = "say hello"
let mul : String
var numOfApple : Int
//hello = "say hi" need to be fixed
a_b = "c and d"
print(a_b)
print(hello)
printC'The value of variable a_b is \(a_b)“)
Drint(aPerson)