转到：基本的loop和strconv [关闭]

Question

I'm a freshman for go language, and some basic things i want to ask how can we make sense for this function.
we need to use "strconv" to fix this issue.

  package main

import (
    "fat"
    "strconv"

)
type Student struct {
    Name string
}
func (stu *Student) Leave() {
    fmt.Println(stu.Name + " Leaving")

}

func (stu *Student) Present() {
     fmt.Println("I am " + stu.Name)

}

func main() {
  fmt.Println("Start of session")
  for i := 0; i < 6; i++ {
    s := Student{Name: fmt.Sprintf("Student%d", i)}
    s.Present()
    fmt.Println("Room Empty")
    defer s.Leave()
}
  fmt.Println("End of session")
} 

The output should be like this

Start of session 
I am Student0
I am Student1
I am Student2
I am Student3
I am Student4
I am Student5 
End of session 
Student5 Leaving 
Student4 Leaving 
Student3 Leaving 
Student2 Leaving 
Student1 Leaving 
Student0 Leaving 
Room Empty

We need to write only one main function() and a simple for loop to get the result.

Answer 1

Here's one way to do it:

fmt.Println("Start of session")
defer fmt.Println("Room Empty")
for i := 0; i < 6; i++ {
    s := Student{Name: "Student" + strconv.Itoa(i)}
    s.Present()
    defer s.Leave()
}
fmt.Println("End of session")

playground example

The deferred functions are executed on return from the function in reverse order.