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https://github.com/golang/go
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2ccd20a646
Fixes #1742. I hope. Also this picks up an update to go_tutorial.html that should already have happened. R=brainman, rsc, peterGo CC=golang-dev https://golang.org/cl/4452050
39 lines
959 B
Go
39 lines
959 B
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "fmt"
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// Send the sequence 2, 3, 4, ... to channel 'ch'.
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func generate(ch chan int) {
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for i := 2; ; i++ {
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ch <- i // Send 'i' to channel 'ch'.
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}
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}
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// Copy the values from channel 'in' to channel 'out',
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// removing those divisible by 'prime'.
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func filter(in, out chan int, prime int) {
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for {
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i := <-in // Receive value of new variable 'i' from 'in'.
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if i % prime != 0 {
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out <- i // Send 'i' to channel 'out'.
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}
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}
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}
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// The prime sieve: Daisy-chain filter processes together.
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func main() {
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ch := make(chan int) // Create a new channel.
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go generate(ch) // Start generate() as a goroutine.
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for i := 0; i < 100; i++ { // Print the first hundred primes.
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prime := <-ch
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fmt.Println(prime)
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ch1 := make(chan int)
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go filter(ch, ch1, prime)
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ch = ch1
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}
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}
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