[Go] Nested struct.

package main

import (
    "fmt"
    "math"
)

type Point struct {
    x float64
    y float64
}

type Circle struct {
    r float64
    p Point
}

func main() {
    c := Circle{r: 5.0, p: Point{x: 3.0, y: 4.0}}

    fmt.Println(c.p.x)
    fmt.Println(c.p.y)

    circumstance := 2 * math.Pi * c.r
    fmt.Println(circumstance)
}