func swap<T>(item1: inout T, item2: inout T)
{
    let tmp = item1
    item1 = item2
    item2 = tmp
}

var name: String = "Kerem", surname: String = "Vatandas"
swap(&name, &surname)
print("isim: \(name), soyisim: \(surname)") // "isim: Vatandas, soyisim: Kerem\n"

var no1: Int = 99, no2: Int = 33
swap(&no1, &no2)
print("no1: \(no1), no2: \(no1)")  // "no1: 33, no2: 33\n"


var dNo1: Double = 12.3, dNo2: Double = 20.5
swap(&dNo1, &dNo2)
print("dNo1 = \(dNo1), dNo2 = \(dNo2)")  // "dNo1 = 20.5, dNo2 = 12.3\n"