golangint64转int的方法

// main.go

package main
import (
 "strconv"
 "fmt"
 "reflect"
)

func main () {
     var id64 int64 = 99
     // method 1:
     strInt64 := strconv.FORMatInt(id64, 10)
     id16 ,_ := strconv.Atoi(strInt64)
     fmt.Println(id16) 
    fmt.Println(reflect.TypeOf(id16))

// main.go
package main
import (
 "unsafe"
 "fmt"
 "reflect"
)

func main () {
     var id64 int64 = 99
    // method 2:
    idPointer := (*int)(unsafe.Pointer(&id64))
    idd16 := *idPointer
    fmt.Println(idd16)
    fmt.Println(reflect.TypeOf(idd16))
}