Go语言基础~B~流程控制

package main
import (
  "fmt"
)

func main() {
  // 流程控制语句
  a := 10
  if a < 10{
    fmt.Println("small")
  } else if a >= 10 && a < 20 {
    if a%10 == 0 {
      fmt.Printf("0 \n")
    }
    fmt.Println("mid")
  } else {
    fmt.Println("big")
  }


  var grade string = "B"
  var marks int = 90
  switch marks {
    case 90: grade = "A"
    case 80: grade = "B"
    case 50,60,70: grade = "C"
    default: grade = "D"
  }
  switch grade {
    case "A":
      fmt.Println("优秀",marks)
    case "B":
      fmt.Println("良好")
    case "C":
      fmt.Println("及格")
    default:
      fmt.Println("差")
  }


  var x interface{}

  switch i := x.(type) {
    case nil:
      fmt.Println("x的类型：nil",i)
    case int:
      fmt.Println("x的类型：int")
    case float64:
      fmt.Println("x的类型：float64")
    case string:
      fmt.Println("x的类型：string")
    default:
      fmt.Println("x的类型：others")
  }
}