.. highlight:: go

numstats1.go
============

::

    // numstats1.go

    // To run at the command line:
    //    $ go run numstats1.go

    package main

    import (
        "bufio"
        "fmt"
        "os"
        "strconv"
    )

    func main() {
        // numbers.txt is assumed to have one integer per line
        file, err := os.Open("numbers.txt")

        // deferred statements are run after the function ends
        defer file.Close()

        // if err is not nil, then something went wrong opening the file
        // and so we immediately end the program by calling panic
        if err != nil {
            panic("couldn't open numbers.txt")
        }

        // read all the numbers into a slice
        nums := []int{} // nums is initially empty
        scanner := bufio.NewScanner(file)
        for scanner.Scan() {
            line := scanner.Text()
            n, err := strconv.Atoi(line)
            if err == nil {
                nums = append(nums, n)
            } else { // err != nil
                fmt.Printf("Couldn't convert \"%v\" to an int (skipping)\n", line)
            }
        } // for

        fmt.Println(nums)

    } // main