Функция, возвращающая несколько значений

package main
 
import (
    "math/rand"
)
 
type Point struct {
    x int
    y int
}
 
func CreateThreePoints() ([3]*Point, error) {
 
    ps := [3]*Point{}
 
    for i := 0; i < 3; i++ {
        p := new(Point)
        p.x = rand.Intn(100)
        p.y = rand.Intn(100)
        ps[i] = p
    }
 
    return ps, nil
}
 
func ModifyThreePoints(ps [3]*Point) error {
 
    for i := 0; i < 3; i++ {
        ps[i].x = 2*ps[i].x + 10
        ps[i].y = -3*ps[i].y - 5
    }
    return nil
}
 
func main() {
    ps, _ := CreateThreePoints()
    _ = ModifyThreePoints(ps)
}

package main
 
import (
    "fmt"
    "math/rand"
)
 
type Point struct {
    x int
    y int
}
 
func CreateThreePoints() []Point {
    ps := make([]Point, 3)
 
    for i := 0; i < 3; i++ {
        ps[i] = Point{x: rand.Intn(100), y: rand.Intn(100)}
    }
 
    return ps
}
 
func ModifyThreePoints(ps []Point) {
 
    for i := 0; i < 3; i++ {
        ps[i].x = 2*ps[i].x + 10
        ps[i].y = -3*ps[i].y - 5
    }
}
 
func main() {
    ps := CreateThreePoints()
    ModifyThreePoints(ps)
}

package main
 
import "fmt"
 
func main() {
    a := 1
    b := 1
    a1 := []int{1}
 
    fmt.Printf("a  before: %d\n", a)
    fmt.Printf("b  before: %d\n", b)
    fmt.Printf("a1 before: %v\n", a1)
    foo1(a, &b, a1)
    fmt.Printf("a  after : %d\n", a)
    fmt.Printf("b  after : %d\n", b)
    fmt.Printf("a1 after : %v\n", a1)
}
 
func foo1(a int, b *int, a1 []int){
    a = a + 1
    *b = *b + 1
    a1[0] = a1[0] +1
}