package main

import "fmt"

func swap(x, y *int) {
	*x, *y = *y, *x
	/*
		tmp := *x
		*x = *y
		*y = tmp
	*/
}

func rotate(ptrs ...*int) {
	if len(ptrs) == 0 {
		return
	}
	tmp := *ptrs[0]
	for i := 1; i < len(ptrs); i++ {
		*ptrs[i-1] = *ptrs[i]
	}
	*ptrs[len(ptrs)-1] = tmp
}

func main() {
	x := 1
	y := 2
	swap(&x, &y)
	fmt.Println("x =", x)
	fmt.Println("y =", y)

	a := 1
	b := 2
	c := 3
	rotate(&a, &b, &c)
	fmt.Println("a =", a)
	fmt.Println("b =", b)
	fmt.Println("c =", c)

	rotate(&a, &b, &c)
	fmt.Println("a =", a)
	fmt.Println("b =", b)
	fmt.Println("c =", c)

	rotate(&a, &b, &c)
	fmt.Println("a =", a)
	fmt.Println("b =", b)
	fmt.Println("c =", c)
}