1 代码片段1

package main

import (
    "fmt"
    "time"
)

func add(a int,b int,c chan int){
    sum :=a+b
    time.Sleep(3*time.Second)
    c<-sum
}


func main(){
    pipe:=make(chan int,1)
    
    go add(10,20,pipe)
    
    sum:= <-pipe
    
    fmt.Println("10+20=",sum)
}

package main

import (
    "fmt"
    "time"
)

func calc(a int, b int) (int, int) {
    sum := a + b
    avg := (a + b) / 2
    return sum,avg
}

func add(a int, b int, c chan int) {
    sum := a + b
    time.Sleep(3 * time.Second)
    c <- sum
}

func main() {

    sum, avg := calc(10, 20) // sum, _ := calc(10, 20)
    
    fmt.Println("sum=", sum,"avg=",avg)
}