personClass.go

package main
import "fmt"

type person struct {
	age int
}

func (p person) NewPerson(initialAge int) person { // constructor
    if initialAge > 0 {
        p.age = initialAge
    } else {
        p.age = 0
        fmt.Println("Age is not valid, setting age to 0.")     
    }
    
	return p
}

func (p person) amIOld() {
	//Do some computation in here and print out the correct statement to the console
    
    if p.age < 13 {
        fmt.Println("You are young.")
    } else if 13 <= p.age && p.age < 18 {
        fmt.Println("You are a teenager.")
    } else {
        fmt.Println("You are old.")
    } 
}

func (p person) yearPasses() person {
	//Increment the age of the person in here
    p.age++
	return p
}
func main() {
    var T,age int

    fmt.Scan(&T)

    for i := 0; i < T; i++ {
        fmt.Scan(&age)
        p := person{age: age}
        p = p.NewPerson(age)
        p.amIOld()
        for j := 0; j < 3; j++ {
            p = p.yearPasses()
        }
        p.amIOld()
        fmt.Println()
    }
}