go实现归并排序

package main

import (
    "fmt"
)

func swap(x, y string) (string, string) {
   return y, x
}

func printSlice(x []int){
   fmt.Printf("len=%d cap=%d slice=%v\n",len(x),cap(x),x)
}

func main() {
   var a uint = 60      /* 60 = 0011 1100 */
   var b uint = 13      /* 13 = 0000 1101 */
   var c uint = 0

   c = a & b       /* 12 = 0000 1100 */
   fmt.Printf("第一行 - c 的值为 %d\n", c )

   c = a | b       /* 61 = 0011 1101 */
   fmt.Printf("第二行 - c 的值为 %d\n", c )

   c = a ^ b       /* 49 = 0011 0001 */
   fmt.Printf("第三行 - c 的值为 %d\n", c )

   c = a << 2     /* 240 = 1111 0000 */
   fmt.Printf("第四行 - c 的值为 %d\n", c )

   c = a >> 2     /* 15 = 0000 1111 */
   fmt.Printf("第五行 - c 的值为 %d\n", c )

   x, y := swap("Google", "Runoob")
   fmt.Println(x, y)

  var numbers []int
  printSlice(numbers)

  /* 允许追加空切片 */
  numbers = append(numbers, 0)
  printSlice(numbers)

  /* 向切片添加一个元素 */
  numbers = append(numbers, 1)
  printSlice(numbers)

  /* 同时添加多个元素 */
  numbers = append(numbers, 2,3,4,5,6)
  printSlice(numbers)

  /* 创建切片 numbers1 是之前切片的两倍容量*/
  numbers1 := make([]int, len(numbers), (cap(numbers))*2)

  /* 拷贝 numbers 的内容到 numbers1 */
  copy(numbers1,numbers)
  printSlice(numbers1)
}