| // +build OMIT | |
| package main | |
| import ( | |
| "fmt" | |
| "math" | |
| ) | |
| type Vertex struct { | |
| X, Y float64 | |
| } | |
| func Abs(v Vertex) float64 { | |
| return math.Sqrt(v.X*v.X + v.Y*v.Y) | |
| } | |
| func Scale(v *Vertex, f float64) { | |
| v.X = v.X * f | |
| v.Y = v.Y * f | |
| } | |
| func main() { | |
| v := Vertex{3, 4} | |
| Scale(&v, 10) | |
| fmt.Println(Abs(v)) | |
| } |