Giá trị và Kiểu dữ liệu trong Swift

let age: Int = 25
let byte: Int8 = 127        // -128 to 127
let short: Int16 = 32767
let int: Int32 = 2147483647
let long: Int64 = 9223372036854775807
 
let ubyte: UInt8 = 255      // 0 to 255
let uint: UInt = 100        // Unsigned

let pi: Double = 3.14159    // 64-bit (mặc định)
let float: Float = 3.14     // 32-bit

let isSwiftFun: Bool = true
let isPythonBetter: Bool = false

let name: String = "Swift"
let letter: Character = "A"
 
// Multi-line string
let multiLine = """
    Line 1
    Line 2
    """

let age = 25            // Int
let height = 1.75       // Double
let name = "Alice"      // String
let isValid = true      // Bool

let age: Int = 25
// let name: String = age  // Error!

let intValue = 10
let doubleValue = Double(intValue)
let stringValue = String(intValue)
 
// Parse string
let str = "42"
if let number = Int(str) {
    print(number)  // 42
}

typealias Age = Int
typealias Name = String
 
let age: Age = 25
let name: Name = "Alice"

let person = ("Alice", 25)
print(person.0)  // Alice
print(person.1)  // 25
 
// Named tuples
let namedPerson = (name: "Bob", age: 30)
print(namedPerson.name)  // Bob
print(namedPerson.age)   // 30