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42// https://github.com/lifei6671/interview-go/blob/master/question/q001.md
package main
import "fmt"
func printNumbers(numbers chan bool, letters chan bool) {
i := 0
for <-numbers {
fmt.Print(i)
i++
fmt.Print(i)
i++
letters <- true
}
}
func printLetters(numbers chan bool, letters chan bool, wait chan bool) {
i := 'a'
for <-letters {
if i > 'z' {
close(wait)
return
}
fmt.Print(string(i))
i++
fmt.Print(string(i))
i++
numbers <- true
}
}
func main() {
numbers := make(chan bool)
letters := make(chan bool)
wait := make(chan bool)
go printNumbers(numbers, letters)
go printLetters(numbers, letters, wait)
numbers <- true
<-wait
}