在 Go 语言中，常量分为有类型常量和无类型常量。

// 有类型常量
const SITE string = "www.tizi365.com"

// 无类型常量
const RELEASE = 3

无类型常量例子:

package main

import "fmt"

func main() {
   // 无类型常量
    const RELEASE = 3

    //  隐式转换
    var x int16 = RELEASE
    var y int32 = RELEASE
    fmt.Printf("type: %T \n", x) //type: int16
    fmt.Printf("type: %T \n", y) //type: int32
}

有类型常量例子：

package main

import "fmt"


func main() {
    // 有类型常量
    const RELEASE int8 = 3

   // 下面赋值都会报错
    var x int16 = RELEASE //cannot use RELEASE (type int8) as type int16 in assignment
    var y int32 = RELEASE //cannot use RELEASE (type int8) as type int32 in assignment
    fmt.Printf("type: %T \n", x)
    fmt.Printf("type: %T \n", y)
}