Source File: ex24b_io_copy/main.go

package main

import (
    "fmt"
    "os"
    "io"
    "log"
)

func main() {
    in_file, err := os.Open("main.go")
    if err != nil { log.Fatal(err) }
    defer in_file.Close()

    out_file, err := os.OpenFile("out.txt", os.O_RDWR|os.O_CREATE, 0644)
    if err != nil { log.Fatal(err) }
    defer out_file.Close()

    n, err := io.Copy(out_file, in_file)
    if err != nil { log.Fatal(err) }

    fmt.Println("read n bytes", n)
}