func swapNum(inout num1: Int, inout num2: Int) {
num1 = num1 ^ num2
num2 = num1 ^ num2
num1 = num1 ^ num2
}
var a = 10
var b = 20
swap(&a, &b)
//a = 10
//b = 20
func swapNum(inout num1: Int, inout num2: Int) {
num1 = num1 ^ num2
num2 = num1 ^ num2
num1 = num1 ^ num2
}
var a = 10
var b = 20
swap(&a, &b)
//a = 10
//b = 20
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