package main

import "fmt"

// x and y declared in the function body will
// be returned. you can still return any variables of
// your choice by explicitly mentioning them

func split(sum int) (x, y int) {
    x = sum * 4 / 9
    y = sum - x
    // no variables!
    return
}

func main() {
    fmt.Println(split(13))
}