(Go)04.go工作区目录规范及简单例子

一.规范目录结构

D:\project\src\go_dev\day1\example1

二.设置GOPAH环境变量

三.hello world

1.hello world

 package main

 import (
     "fmt"
 )

 func main () {
     fmt.Println("Hello World!")
 }

go build go_dev\day1\example1

生成example1.exe

执行example1.exe

2.goroute循环

goroute.go

 package main

 import (
     "fmt"
 )

 func test_goroute(a int) {
     fmt.Println(a)
 }

main.go

 package main

 import (
     "time"
 )

 func main() {

     for i :=; i <; i++ {
         go test_goroute(i)
     }
     time.Sleep(*time.Second)
 }

3.goroute_example

代码目录结构

 package goroute

 func Add(a int, b int, c chan int) {
     sum := a + b
     c <- sum

 } 

add.go

 package main

 import (
     "go_dev/day1/goroute_example/goroute"
     "fmt"
 )

 func main() {
     //var pipe chan int
     //pipe = make(chan int, 1) 

     pipe := make(chan int, )   //等同于上二行
     go goroute.Add(, , pipe)

     sum := <- pipe
     fmt.Println("sum =", sum)
 }

main.go

构建代码

D:\project>go build -o bin/goroute_example.exe go_dev/day1/goroute_example/main

D:\project\bin>goroute_example.exe
sum = 400