package main

import (
	"fmt"
	"math"
)

type Vertex struct {
	X, Y float64
}

// This is a method - a function that implements a receiver (the part between "func" and "Abs()")

func (v Vertex) Abs() float64 {
	return math.Sqrt(v.X*v.X + v.Y*v.Y)
}

// The method above has the same functionality as the function below

func Abs(v Vertex) float64 {
	return math.Sqrt(v.X*v.X + v.Y*v.Y)
}

func main() {
	v := Vertex{3,4}
	fmt.Println(v.Abs())
	w := Vertex{3,4}
	fmt.Println(Abs(w))
}