go基本構文メモ

for i := 0; i < 10; i++ {
	sum += i
}

var pow = []int{1, 2, 4, 8, 16, 32, 64, 128}

for i, v := range pow {
	fmt.Printf("2**%d = %d\n", i, v)
}

if x < 0 {
	return sqrt(-x) + "i"
}

if v := math.Pow(x, n); v < lim {
    return v
}

if v := math.Pow(x, n); v < lim {
    return v
} else {
    fmt.Printf("%g >= %g\n", v, lim)
}

switch os := runtime.GOOS; os {
case "darwin":
    fmt.Println("OS X.")
case "linux":
    fmt.Println("Linux.")
default:
    // freebsd, openbsd,
    // plan9, windows...
    fmt.Printf("%s.\n", os)
}

t := time.Now()
switch {
case t.Hour() < 12:
    fmt.Println("Good morning!")
case t.Hour() < 17:
    fmt.Println("Good afternoon.")
default:
    fmt.Println("Good evening.")
}

func main() {
	defer fmt.Println("world")

	fmt.Println("hello")
}

text := fmt.Sprintf("id: %d, value: %s", index, value)