Hackerrank -- 30 Days of Code -- Day 4 challenge solution.

main.go

package main

import "fmt"

// Person is the main object we're working with.
type Person struct {
	Age int
}

// Initialize sets things up.
func (p *Person) Initialize(initialAge int) {
	if initialAge < 0 {
		p.Age = 0
		fmt.Println("This person is not valid, setting age to 0.")
	} else {
		p.Age = initialAge
	}
}

// AmIOld checks to see if the person is old.
func (p *Person) AmIOld() {
	switch {
	case p.Age < 13:
		fmt.Println("You are young.")
	case p.Age >= 13 && p.Age < 18:
		fmt.Println("You are a teenager.")
	default:
		fmt.Println("You are old.")
	}
}

// YearPasses ages the person by one year.
func (p *Person) YearPasses() {
	p.Age++
}

func main() {
	var num, age int

	// Get the number of ages being submitted.
	fmt.Scan(&num)

	// Get the age from the input.
	for i := 0; i < num; i++ {
		fmt.Scan(&age)

		// Create our person; check their age; age them 3 years; check their age again.
		p := Person{}
		p.Initialize(age)
		p.AmIOld()
		for j := 0; j < 3; j++ {
			p.YearPasses()
		}
		p.AmIOld()

		fmt.Println()
	}
}

template.go

package main

import "fmt"

// Person is the main object we're working with.
type Person struct {
	Age int
}

// Initialize sets things up.
func (p *Person) Initialize(initialAge int) {

}

// AmIOld checks to see if the person is old.
func (p *Person) AmIOld() {

}

// YearPasses ages the person by one year.
func (p *Person) YearPasses() {

}

func main() {
	var num, age int

	// Get the number of ages being submitted.
	fmt.Scan(&num)

	// Get the age from the input.
	for i := 0; i < num; i++ {
		fmt.Scan(&age)

		// Create our person; check their age; age them 3 years; check their age again.
		p := Person{}
		p.Initialize(age)
		p.AmIOld()
		for j := 0; j < 3; j++ {
			p.YearPasses()
		}
		p.AmIOld()

		fmt.Println()
	}
}