go语言switch语句

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package main

import (
	"fmt"
)

func main() {
	score := 95
	/*
		>90  A
		80-89 B
		70-79 C
		60-69 D
		<60 E
	*/
	grade := "A"
	//if score > 90 {
	//	grade = "A"
	//}else if score >= 80 && score<= 89{
	//	grade = "B"
	//}else if score >= 70 && score<= 79{
	//	grade = "C"
	//}else if score >= 60 && score<= 69{
	//	grade = "D"
	//}else{
	//	grade = "E"
	//}
	// fallthrough 继续执行

	// 分支多所以用switch

	switch {
	case score >= 90:
		grade = "A"

		fmt.Println("优")
	case score >= 80 && score <= 89:
		grade = "B"
	case score >= 70 && score <= 79:
		grade = "C"
	case score >= 70 && score <= 79:
		grade = "D"
	default:
		grade = "E"
	}

	fmt.Println(grade)
	//不同的 case 表达式使用逗号分隔。一分支多值
	var a = "daddy"
	switch a {
	case "mum", "daddy":
		fmt.Println("family")
	}
	//
	var x interface{} // x 的类型 :<nil>

	switch i := x.(type) {
	case nil:
		fmt.Printf(" x 的类型 :%T", i)
	case int:
		fmt.Printf("x 是 int 型")
	case float64:
		fmt.Printf("x 是 float64 型")
	case func(int) float64:
		fmt.Printf("x 是 func(int) 型")
	case bool, string:
		fmt.Printf("x 是 bool 或 string 型")
	default:
		fmt.Printf("未知型")
	}
}

　　

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