Go - Struct

Introduction-Struct

struct

1. user-defined data type.

2. a structure that groups together data elements.

3. provide a way to reference a series of grouped values through a single variable name.

4. used when it makes sense to group or associate two or more data variables.

Declaring and Initializing a Struct

struct-declaration

  type struct {
    // list of fields
    }

    type Circle struct {
      x float64
      y float64
      r float64
    }

  type Student struct {
    name string
    rollNo int
    marks []int
    grades map[string] int

struct-initialize

  var 
    var s Student

main.go

  package main
  import "fmt"
  type Student struct {
    name string
    rollNo int
    marks []int
    grades map[string] int
  }
  func main() {
    var s Student
    fmt.Printf("%+v", s)
  }
  >>> go run main.go
  {name: rollNo:0 marks:[] grades:map[]}

Accessing Fields

  .

main.go

  package main
  import "fmt"
  type Circle struct {
    x int
    y int
    radius int
  }

  func main () {
    var c Circle
    c.x = 5
    c.y = 5
    c.radius = 5
    fmt.Printf("%+v \n", c)
    fmt.Printf("&+v \n", c.area)
  }
  >>> go run main.go
      c.area undefined (type Circle has no field or method area)

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