(Go)04.go工作区目录规范及简单例子

一.规范目录结构

D:projectsrcgo_devday1example1

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_devday1example1

 

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 :=0; i <100; i++ {
        go test_goroute(i)
    }
    time.Sleep(2*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

} 

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, 1)   //等同于上二行
    go goroute.Add(100, 300, pipe)


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

构建代码

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

D:projectin>goroute_example.exe
sum = 400