package main
// 生成2, 3, 4, ... 到 channel 'ch'中.
func Generate(ch chan<- int) {
    for i := 2; ; i++ {
        ch <- i  // Send 'i' to channel 'ch'.
    }
}
// 从管道复制值 'in' 到 channel 'out',
// 移除可整除的数 'prime'.
func Filter(in <-chan int, out chan<- int, prime int) {
    for {
        i := <-in    // 接收值 'in'.
        if i%prime != 0 {
            out <- i // 传入 'i' 到 'out'.
        }
    }
}
func main() {
    ch := make(chan int)    // Create a newchannel.
    go Generate(ch) // Launch Generate goroutine.
    for i := 0; i < 10; i++ {
        prime := <-ch
        print(prime, "\n")
        ch2 := make(chan int)
        go Filter(ch, ch2, prime)
        ch = ch2
    }
}