package main

import (
	"os"
	"encoding/binary"
)

func check(e error) {
    if e != nil {
        panic(e)
    }
}

func writeInt64(filename string, n int64) {
    f, err := os.Create(filename)
    check(err)
    defer f.Close()

    err = binary.Write(f, binary.LittleEndian, n)
    check(err)
}

func main() {
	writeInt64("eingabe.bin", int64(54))
}