Sequential printing

main.go

package main

import (
	"fmt"
	"os"
)

func main() {

	c1 := make(chan int, 1)
	c2 := make(chan int, 1)
	c3 := make(chan int, 1)
	c4 := make(chan int, 1)
	c5 := make(chan int, 1)
	c6 := make(chan int, 1)

	c1 <- 1
	for {
		select {
		case <-c1:
			fmt.Println(1)
			c2 <- 1
		case <-c2:
			fmt.Println(2)
			c3 <- 1
		case <-c3:
			fmt.Println(3)
			c4 <- 1
		case <-c4:
			fmt.Println(4)
			c5 <- 1
		case <-c5:
			fmt.Println(5)
			c6 <- 1
		case <-c6:
			fmt.Println(6)
			os.Exit(0)
		}
	}
}