GO的第二天hello world

进行了些简单的运用

package main
import (
   "fmt"
   s "gotest/sumjs"
)

func main()  {
   b := 3
   a := s.SumAdd(1,2)
   c := s.Sub(a,b)
   fmt.Println("hello world!",a,b,c)
   
   slice := []int{10, 20, 30, 40, 50}
   newSlice := slice[1:3:3]
   newSlice = append(newSlice, 60)
   newSlice = append(newSlice, 70)
   newSlice = append(newSlice, 80)
   newSlice = append(newSlice, 90)
   fmt.Println("========",slice,"+++++",newSlice)
 
   slice := [][]int{{10}, {100, 200}}
   slice[0] = append(slice[0], 20)
   slice[0] = append(slice[0], 30)
   slice[0] = append(slice[0], 30)

   fmt.Println("========",slice,"+++++","-----")
}

package sumjs
func SumAdd(x,y int)int  {
   return x+y
}

func Sub(x,y int) int  {
   return x-y
}