How to display student list in this program in Go language?-CodePudding

package main

import (
    "fmt"
)

type Student struct {
    rollnumber int
    name       string
    address    string
}

func NewStudent(rollno int, name string, address string) *Student {
    s := new(Student)
    s.rollnumber = rollno
    s.name = name
    s.address = address
    return s
}

type StudentList struct {
    list []*Student
}

func (ls *StudentList) CreateStudent(rollno int, name string, address string) *Student {
    st := NewStudent(rollno, name, address)
    ls.list = append(ls.list, st)
    return st
}

func main() {
    student := new(StudentList)
    student.CreateStudent(24, "Asim", "AAAAAA")
    student.CreateStudent(24, "Naveed", "BBBBBB")
    fmt.Println(student)
}

/* When I run this program it gives addresses in output instead of the values I stored kindly check and let me know how can I display the actual data. I am a newbie in Go*/

CodePudding user response：

You can remove the pointer by dereferencing it:

fmt.Println(*student)

But your StudentList.list is an array of pointers to students so you need to derefence those too. My 2 cents, don't use pointers unless you have good reason to.

See your code slightly modified: https://go.dev/play/p/PkNkUF0EFt7

CodePudding user response：

You can implement Stringer on struct StudentList to modify the output on fmt pkg.

This is the example:

...
type StudentList struct {
    list []*Student
}
...


func (ls StudentList) String() string {
    var b strings.Builder
    for _, v := range ls.list {
        fmt.Fprintf(&b, "% v\n", *v)
    }
    return b.String()
}

playground