golang中结构体指针的应用

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package main   import (     "fmt" )   type School struct {     brand string     city  string } type Class struct {     name string     number int     *School }   func main() {     // 创建学校     s1 := &School{brand: "一中", city: "北京"}       var classSlice []Class     var cls Class     // 循环创建班级     for {         fmt.Printf("请输入班级名：")         fmt.Scan(&cls.name)         if cls.name == "Q" || cls.name == "q" {             break         }         fmt.Printf("请输入班级人数：")         fmt.Scan(&cls.number)         // 添加班级所属学校         cls.School = s1         // 将班级添加到班级切片中去         classSlice = append(classSlice, cls)     }     fmt.Println(classSlice)       for _, cls := range classSlice {         message := fmt.Sprintf("%s-%d-%s-%s", cls.name, cls.number, cls.School.city, cls.School.brand)         fmt.Println(message)     } }