Go基礎編-変数

bool
string
(u)int、(u)int8、(u)int16、(u)int32、(u)int64
uintptr   
byte
rune    ，32  ，   char
float32、float64
complex32、complex64    

func typeConversion () {
    var int a = 5
    var b = "str"
    c := 3
    var int d
    d = int(a / c) 
    fmt.Println(d, b)
}

      ：var name type = value
      ：var name = value //name  value         
      ：name := value //        ，name  value         
         ： var (name1 = value1 name2 = value2 ...)

func definedVariable() {
    var a int = 5
    var b = "str"
    c, d := 3, "string"
    var e int   //        0
    var f string //         ""
    var g bool  //bool      false
}
//    
var {
    name1 = 100
    name2 = "abc"
    ...
}

      ：const name type = value 
      ：const name = value //name  value         

func definedConst () {
    const fileName string = "readme.txt"
    const a, b = 12, 5
    var c int
    c = int(math.Sqrt(a*a + b*b)) //       ，         ，      const a, b int = 3, 4，     
    fmt.Println(fileName, a, b, c)
}

   
const(
name1 = value1
name2 = value2
 ...
)
iota       
iota      ：const ( name1=iota    name2 )

func dedinedEnmu () {
    const (
        doctor_type = 0
        nurse_type = 1
        pharmacist_type = 2
    )
fmt.Println(dcotor_type, nurse_type, pharmacist_type) // 0,1,2

const (
        doctor_type = iota
        nurse_type
        pharmacist_type 
    )
fmt.Println(dcotor_type, nurse_type, pharmacist_type) // 0,1,2
}