15-112
Summer 20

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CMU 15-112: Fundamentals of Programming and Computer Science
Class Notes: Structs

  1. Structs
    // Structs allow us to create new types that are bundles of data package main import "fmt" type Point struct { X int Y int } func main() { p1 := Point{1, 2} p2 := Point{0, 0} fmt.Println(p1, p2) }

    Different ways to initialize structs
    package main import "fmt" type Point struct { X int Y int } func main() { p1 := Point{} p2 := Point{X: 1, Y: 2} p3 := Point{X: 5} fmt.Println(p1, p2, p3) }

    2. Mixed types
    package main import "fmt" type LabeledPoint struct { X int Y int Label string } func main() { p := LabeledPoint{0, 0, "origin"} fmt.Println(p) }

    Accessing and Modifying Parameters
    package main import "fmt" type Point struct { X int Y int } func main() { p := Point{112, 42} fmt.Println(p) fmt.Println(p.X) fmt.Println(p.Y) p.X = 15 p.Y = 112 fmt.Println(p) }

    Calling functions on structs
    package main import ( "fmt" "math" ) type Point struct { X float64 Y float64 } func distance(p1, p2 Point) float64 { return math.Hypot((p1.X - p2.X), (p1.Y - p2.Y)) } func main() { p1 := Point{0, 3} p2 := Point{4, 0} fmt.Println(distance(p1, p2)) }