Write number to file

---

examples/write-number/write_number_file.go

package main

import (
    "fmt"
    "os"
)

func main() {
    var filename = "data.txt"

    answer := 42

    fh, err := os.Create(filename)
    if err != nil {
        fmt.Println(err)
        os.Exit(1)
    }

    text := fmt.Sprintf("%d\n", answer)
    fh.WriteString(text)
    fh.Close()

}