golang 基础语法需要注意的

1. for range遍历切片, map

package main
import (
  "fmt"
)
func Sum(set []int) int {
  var result int
  //for num := range set {   //这个的num是索引，正确的写法是 for _, value := range set{
  for _, num := range set{   // range很奇怪，又能返回一个值，又能返回2个值
    result += num
  }
  return result
}
func main() {
  set := []int{17, 23, 100, 76, 55}
  sum := Sum(set)
  fmt.Printf("sum is : %d", sum)
}