How to make fmt.Scanln() read into a slice of integers

Question

I have a line containing 3 numbers that I want to read from stdin with fmt.Scanln() but this code won't work:

X := make([]int, 3)
fmt.Scanln(X...)
fmt.Printf("%v\n", X)

I get this error message:

cannot use X (type []int) as type []interface {} in function argument

I don't get it.

Answer 1

Idiomatic Go would be:

func read(n int) ([]int, error) {
  in := make([]int, n)
  for i := range in {
    _, err := fmt.Scan(&in[i])
    if err != nil {
       return in[:i], err
    }
  }
  return in, nil
}

interface{} means nothing. Please don't use it if you don't have to.