a pitfall of slice

slice_2.go

package main

import (
	"fmt"
)

func main() {
	//case 1
	a := []int{}
	a = append(a, 1)
	a = append(a, 2)
	b := append(a, 3)
	c := append(a, 4)
	fmt.Println("a: ", a, "\nb: ", b, "\nc: ", c)
	
	//case 2
	a = append(a, 3)
	x := append(a, 4)
	y := append(a, 5)
	fmt.Println("a: ", a, "\nx: ", x, "\ny: ", y)
}

/*
这是上面程序的输出么
a:  [1 2] 
b:  [1 2 3] 
c:  [1 2 4]
a:  [1 2 3] 
x:  [1 2 3 4] 
y:  [1 2 3 5]
*/