package main
import "fmt"

func MyPrintf(args ...interface{}){
    for _, arg := range args {
        switch arg.(type) {
        case int :
            fmt.Println("\"", arg, "\"", "is an int value.")
        case string :
            fmt.Println("\"", arg, "\"", "is a string value.")
        case int64 :
            fmt.Println("\"", arg, "\"", "is an int64 value.")
            default :
            fmt.Println("\"", arg, "\"", "is an unknown type.")
        }
    }
}

func main(){
    var v1 int = 1
    var v2 int64 = 234
    var v3 string = "hello"
    var v4 float32 = 1.123
    MyPrintf(v1, v2, v3, v4)
}

$ go run myprintf.go
" 1 " is an int value.
" 234 " is an int64 value.
" hello " is a string value.
" 1.123 " is an unknown type.