面试1--切片

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package main   import "fmt"   func main() {     a := []int{1, 2, 3}     slice(a)     fmt.Println("1", a)     //10 2 3     slicePtr1(&a)     fmt.Println("2", a)     //20 20 3 20     slicePtr2(&a)     fmt.Println("3", a)     //30 30 3 20     slicePtr3(&a) }   func slice(s []int) {     s[0] = 10     s = append(s, 10)     s[1] = 10     fmt.Println(s)  //10 10 3 10 }   func slicePtr1(s *[]int) {     (*s)[0] = 20     *s = append(*s, 20)     (*s)[1] = 20 }   func slicePtr2(s *[]int) {     b := *s     b[0] = 30     b = append(b, 30)     b[1] = 30 }   func slicePtr3(s *[]int) {     b := *s     b = append(b, 40)     fmt.Println("4", b)     //30 30 3 20 40     *s = append(*s, 50)     fmt.Println("5", b)     //30 30 3 20 50 }