57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
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package main
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import (
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"fmt"
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)
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type Vertex struct {
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X int
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Y int
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}
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func main() {
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fmt.Println("A struct is a collection of fields")
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fmt.Println(Vertex{1, 2})
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fmt.Println("struct fields are accessed by using a dot")
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v := Vertex{6, 8}
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fmt.Printf("%T, %v\n", v, v)
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fmt.Printf("%T, %v\n", v.X, v.X)
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fmt.Printf("%T, %v\n", v.Y, v.Y)
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fmt.Printf("\n\n")
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fmt.Println("Struct fields can be accessed through a struct pointer")
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v2 := Vertex{6, 8}
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p := &v2
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// var p *Vertex = &v2 // ALSO VALID
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(*p).X = 10
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fmt.Printf("%T, %v, %p\n", p, p, p)
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fmt.Printf("%T, %v\n", *p, *p)
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fmt.Println("Go also allows to use struct pointers without * symbol while accesing elements:")
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p.X = 15 // VALID
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fmt.Println(*p)
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fmt.Printf("\n\n")
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fmt.Println("You can also use struct literals for assigning struct elements")
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var (
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v3 = Vertex{10, 20}
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v4 = Vertex{X: 1} // Y:0
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v5 = Vertex{} // X:0, Y:0
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v6 = Vertex{Y: 15, X: 75}
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p2 = &Vertex{1, 2}
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)
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fmt.Printf("%T, %v\n", v3, v3)
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fmt.Printf("%T, %v\n", v4, v4)
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fmt.Printf("%T, %v\n", v5, v5)
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fmt.Printf("%T, %v\n", v6, v6)
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fmt.Printf("%T, %v\n", p2, p2)
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fmt.Printf("%T, %v\n", *p2, *p2)
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}
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