1 package main
2 
3 import (
4     "fmt"
5 )
6 
7 func main () {
8     fmt.Println("Hello World!")
9 }

1 package main
2 
3 import (
4     "fmt"
5 )
6 
7 func test_goroute(a int) {
8     fmt.Println(a) 
9 }

 1 package main
 2 
 3 import (
 4     "time"
 5 )
 6 
 7 
 8 func main() {
 9 
10     for i :=0; i <100; i++ {
11         go test_goroute(i)
12     }
13     time.Sleep(2*time.Second)
14 }

1 package goroute
2 
3 
4 func Add(a int, b int, c chan int) {
5     sum := a + b
6     c <- sum
7 
8 } 

 1 package main
 2 
 3 import (
 4     "go_dev/day1/goroute_example/goroute"
 5     "fmt"
 6 )
 7 
 8 
 9 func main() {
10     //var pipe chan int
11     //pipe = make(chan int, 1) 
12     
13     pipe := make(chan int, 1)   //等同于上二行
14     go goroute.Add(100, 300, pipe)
15 
16 
17     sum := <- pipe
18     fmt.Println("sum =", sum)
19 }