func swap(_ a: inout Int, _ b: inout Int) {
var t = 0
t = a
a = b
b = t
}
var a = 5
var b = 6
swap(&a, &b)
print(a, b)
func swap(_ a: inout Int, _ b: inout Int) {
var t = 0
t = a
a = b
b = t
}
var a = 5
var b = 6
swap(&a, &b)
print(a, b)