Why doesn't this work? It works with := operator but why can't we use = operator here?
package main
import "fmt"
type Vertex struct {
X, Y int
}
func main() {
v1 = Vertex{1, 2} // has type Vertex
v2 = Vertex{X: 1} // Y:0 is implicit
v3 = Vertex{} // X:0 and Y:0
p = &Vertex{1, 2} // has type *Vertex
fmt.Println(v1, p, v2, v3)
}
You can create an instance of your new Vertex
type in a variety of ways:
1: var c Circle
You can access fields using the .
operator:
package main
import "fmt"
type Vertex struct {
X, Y int
}
func main() {
var f Vertex
f.X = 1
f.Y = 2
fmt.Println(f) // should be {1, 2}
}
2: Using :=
operator
package main
import "fmt"
type Vertex struct {
X, Y int
}
func main() {
f := Vertex{1, 2}
fmt.Println(f) // should be {1, 2}
}