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【自己学習】Go言語を学ぶ(3)

Posted at

公式チュートリアルから基本を学ぶ
https://go-tour-jp.appspot.com/list

Variables(変数)

  • varで変数宣言を行える。

サンプルコード

  • c, python, javaはbool型
  • i はint型
package main

import "fmt"

var c, python, java bool

func main() {
  var i int
  fmt.Println(i, c, python, java)
}

結果:0 false false false

Variables with initializers(変数の初期化)

  • var 宣言では、変数毎に初期値を指定できます。

サンプルコード

  • i jをint型で i = 1 j = 2を指定
package main

import "fmt"

var i, j int = 1, 2

func main() {
  var c, python, java = true, false, "no!"
  fmt.Println(i, j, c, python, java)
}

結果:1 2 true false no!

Short variable declarations(短い変数宣言)

  • var 宣言の代わりに、短い := の代入文を使い、型宣言ができる。

サンプルコード

  • k := 3で代入
package main

import "fmt"

func main() {
  var i, j int = 1, 2
  k := 3
  c, python, java := true, false, "no!"

  fmt.Println(i, j, k, c, python, java)
}

結果:1 2 3 true false no!

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