package main
import (
"fmt"
"math"
"reflect"
)
type Vertex struct {
X, Y float64
}
func (v *Vertex) Scale(f float64) {
v.X = v.X * f
v.Y = v.Y * f
}
func (v *Vertex) Abs() float64 {
return math.Sqrt(v.X*v.X + v.Y*v.Y)
}
func main() {
v := &Vertex{3, 4} // Whether or not with "&", the values don't change below.
fmt.Printf("Before scaling: %+v, Abs: %v
", v, v.Abs())
v.Scale(5)
fmt.Printf("After scaling: %+v, Abs: %v
", v, v.Abs())
fmt.Println(reflect.TypeOf(Vertex{3,4}))
}
Hello, I am learning golang now. I do not understand what is the use of adding "&", if it does not make any change on the result value?
I thought we add "&" to variables to get the memory address. If we can add "&" to Vertex{3,4}, does this mean it is variable? Confused.