struct 構造名 {
var プロパティ名: プロパティの型 = 式 // 再生可能なプロパティ
let プロパティ名: プロパティの型 = 式　// 再生不可能なプロパティ
}

struct MyNameIs {
    var name = "TERADA"
}

let myNameIsEng = MyNameIs()
var myNameIsJpn = MyNameIs()
myNameIsJpn.name = "寺田"

let englishName = myNameIsEng.name //TERADA
let japaneseName = myNameIsJpn.name //寺田

struct Greeting {
    static let signature = "Sent from iPhone"

    var to = "Terada"
    var body = "Hello!"
}

func print(greeting: Greeting){
    print("to: \(greeting.to)")
    print("body: \(greeting.body)")
    print("signature: \(Greeting.signature)")
}

let greeting1 = Greeting()
var greeting2 = Greeting()
greeting2.to = "Kunio"
greeting2.body = "Hi!"

print(greeting: greeting1)
print("---")
print(greeting: greeting2)

to: Terada
body: Hello!
signature: Sent from iPhone
---
to: Kunio
body: Hi!
signature: Sent from iPhone